最新刊期
卷 32 ， 期 1 ， 2011
- 摘要：Sequence stratigraphic theories of carbonate are employed in a sequence stratigraphic study on the Lower Paleozoic carbonates in Tarim Basin through outcrop observation, drilling data analysis as well as integra ted seismic interpretations. Together with the study, the sequence boundaries are identified and stratigraphic framework is established. As a result, eight sequences identified in the Cambrian carbonates are described. Except for sequence 1(SQ 1) as a ascending base level semicycle sequence, the other sequences are all falling base level semicycle sequences. Sequences 5, 6, 7 and 8 are considered key hydrocarbon exploration targets. In Lunnan area, exploration activities shall be focused on sequences 6, 7 and 8 for complex structurallithologic traps. A model for the Cambrian carbonate sequences in the Tarim Basin is developed and provides helpful aid to searching for places with favorable conditions for the formation of stratigraphic lithologic traps.关键词：层序识别;碳酸盐岩;寒武系;轮南地区;塔里木盆地2043|1032|0更新时间：2023-05-30
- 摘要：Evaluating conditions of source rock development by geobiological approaches is an important supplement for the traditional evaluation method of source rocks based on analyses of remnant organic matter. This method is especially suitable for source rock evaluation in areas with highlymatured marine carbonate rocks. Our study is based on observation of outcrops and focused on a systematic analysis of the depositional environment, fossil organism, trace element data and total organic carbon in the Lower Cambrian of the Yangba area in Nanjiang County, Sichuan Basin. The forming conditions for the Lower Cambrian source rocks are recognized through a study on the habitat types, oceanic paleoproductivity, paleooxygenation facies and burial efficiency by using geobiolgical principles. The results show that the lower part of the Qiongzhusi Formation has the most favorable conditions for development of highquality hydrocarbon source rocks as it has higher original organic content, anaerobic sedimentary environment and higher burial efficiency of organic carbon. In contrast, the lower part of the Shilongdong Formation possesses basic geobiological conditions for development of ordinary source rocks.关键词：地球生物学;古生产力;古氧相;海相烃源岩;筇竹寺组;南江杨坝地区;四川盆地2569|853|0更新时间：2023-05-30
- 摘要：The Wumishan Formation in Jibei Depression is of carbonate tideflat sedimentary, and can be divided into three subfacies (supralittoral zone, subtidal zone, intertidal zone) and four microfacies (upper and lower intertidal zones as well as highenergy and lowenergy subtidal zones). An analysis of trace element and oxide enrichment pattern is carried out by using factor analysis method. The result shows that the carbonates in the area are affected by terrigenous muddy water sedimentation and that there is a close relationship between its geochemical behaviors and sedimentary environment. Contents of both trace elements and oxide significantly increase from supralittoral zone to intertidal zone and to subtidal zone. As the water depth increases, the content of Sr and B, which are sensitive to carbonate sedimentary environment, and Sr/Ba, Sr/Ca and Mn/Fe ratios, rise from the supralittoral zone to subtidal zone. These features indicate that the geochemical characteristics of the area can be used as important marks for facies analysis and that the accuracy of field division of stratum and sedimentary facies is relatively high.关键词：碳酸盐岩;地球化学;因子分析;雾迷山组;冀北坳陷;燕山地区2254|542|0更新时间：2023-05-30
- 摘要：This paper examines carefully the sedimentary features, biological associations and characteristics of organic carbon of the Upper Permian Dalong Formation in the northern margin of the MiddleUpper Yangtze region. We also discuss the relationship between regressive sequences and highquality source rocks. According to the study, we believe that the depositional setting of the Upper Permian Dalong Formation belong to regressive continental shelf facies which changes from the outer shelf in the early period to the inner shelf in the middletolate period. The change of facies belt brought about shallowwater organism, especially plenty of bacillusalga, which continuously provided organic materials for the development of highquality source rocks in the Dalong Formation in the MiddleUpper Yangtze region. The organic carbon content in the upper part is higher than that in the lower part of the Dalong Formation. In addition, ascending current repeatedly brought nutritious salt from deep water to sallow water, which made the biological groups thrive and promoted the productivity of organic matter. Therefore, highquality source rocks developed in large scale in the Dalong Formation. From this study we come to the conclusion that the regressive continental shelf is also an important location for the development of source rocks.关键词： Key words：highquality source rock;Dalong Formation;Upper Permian;regressive continental shelf;MiddleUpper Yangtze region1822|885|0更新时间：2023-05-30
- 摘要：Hydrocarbon source rocks were developed in the Pingliang Formation of the Middle Ordovician in southern Ordos Basin. Based on test of over 40 outcrop samples from five sections in southern Ordos Basin, we studied the paleosalinity, hydrodynamic conditions and redox conditions during the Pingliang Age of the Middle Ordovician through trace element analysis. Two major paleosedimentary environments are identified: deepwater slope with brackish, weak hydrodynamics and reducing conditions; and carbonate platform with brine, strong hydrodynamics and oxidizingprone and weak reducing conditions. The former was favorable for development of quality hydrocarbon source rocks. By conducting a comprehensive evaluation of the TOC, organic types and maturity, we come to the conclusion that the mudstone at the lower part of the Formation is the major source rocks, which are mediocre to excellent gas source rocks featuring in large thickness, high TOC, favorable kerogen types (sapropeltype predominant) and high maturity. It is therefore suggested that the northern Weibei high be favorable for exploring the lower Paleozoic in southern Ordos Basin.关键词：关键词：烃源岩;沉积环境;微量元素;地球化学;平凉组;奥陶系;鄂尔多斯盆地2573|1122|0更新时间：2023-05-30
- 摘要：To examine the role of water in the interaction of organic matter with smectite in argillaceous source rocks with situ DRIFTS, we make a study of clays with grainsize less than 2μm extracted from hydrocarbon source rocks with high clay content in the Neocene, Jiyang Depression, eastern China. The DRIFT spectra show that the evolution of the adsorption water is accompanied by significant changes in the location and shape of the carboxyl above 250°C and both of them almost disappear at 400℃. An attempt for semiquantitative measurement of vibration peaks is also carried out. Result shows that the loss of adsorption water and carboxyl are in proportion above 250°C, suggesting most carboxylic acids interact with interlayer hydrated cations of smectite through hydrogen bond, and water molecules are bridges between carboxylic acids and smectite, a most important mechanism for organosmectite interaction. Due to the effect of water bridge, dehydrate temperature of water and carboxylic acids are higher than that of pure smectite and carboxylic acids. As water bridge breakdown at higher temperature, water molecules and carboxylic acids were expelled from interlayer of smectite simultaneously. The water bridge mechanism of organosmectite interaction and dehydration lagging of water bridge and carboxylic acids have a great influence on hydrocarbon generation, expulsion and primary migration. 关键词：关键词：水桥;蒙皂石;原位漫反射红外光谱;有机粘土复合体;泥质烃源岩;济阳坳陷1899|890|0更新时间：2023-05-30
- 摘要：Previous exploration activities indicate that the Changxing Formation of the Late Permian and the Feixianguan Formation of the Early Triassic in northeast of Sichuan Basin have great potential of gas discoveries. The reservoirs are mostly developed in platform margin reef & bank facies, restricted platform facies, open platform facies and platform margin rampcontinental shelf facies. In order to deepen the understanding of the reservoir characteristics，we studied the petrophysical characteristics of rock samples from different sedimentary facieses in the two formations from three blocks namely as Xuanhan, Tongnanba and Yuanba in Da County of Sichuan Province based on available log interpretations and sample test results. It turns out that the sedimentary facies controlled the rock types, which in turn result in varying reservoirs petrophysical characteristics due to differences in internal textures and primary porosity. It also points out that reservoirs are better developed in facies deposited in an environment with higher energy. Reservoirs in the platform margin reef & bank facies have the best petrophysical characteristics and are of porous types (type Ⅱ). The platform facies contains complex reservoirs of fractureporosity type (type Ⅲ) with second best petrophysical characteristics. The reservoirs in the platform margin rampcontinental shelf facies have poor petrophysical characteristics and are of fracture type. We therefore suggest that the platform margin reef & bank facies be the focus of exploration activities.关键词：岩石物性;储层特征;沉积相;长兴组;飞仙关组;四川盆地2586|823|0更新时间：2023-05-30
- 摘要：The southern North China is considered one of the areas with great hydrocarbon potentials. The Upper Paleozoic coalbearing strata are major exploration targets in the area. An analysis of more than 600 sets of vitrinite reflectance (Ro) data and other geothermometer data such as Tmax and spore color index indicates that the thermal evolution of the Upper Paleozoic is uneven, showing a general trend of higher in the north and west but lower in the south and east. By combining a reconstruction of the eroded strata with an analysis of the paleostructure evolution, fission track dating and magmatic rocks dating, we concluded that the Upper Paleozoic strata experienced complex thermal evolution history and hydrocarbon generation history, and identified three hydrocarbon generation types including the early, the earlylate and the continuous types. The organic matter in the Upper Paleozoic strata mainly experienced hypozonal metamorphism in early stage. Magmatic thermal metamorphism and dynamic metamorphism were the major causes of local abnormal high thermal evolution. The regional tectonicthermal events in the MidLate Mesozoic were the crucial factors controlling the regional high thermal evolution of the Paleozoic in TaikangJiyuan area. The Upper Paleozoic with favorable conditions for secondary hydrocarbon generation, accumulation and preservation are the realistic exploration targets. They mainly occur in deep of MesoCenozoic depression, such as the middle part of the Niqiuji sag and the middle part of the TanzhuangShenqiu sags.关键词：关键词：热演化史;生烃;煤系地层;上古生界;倪丘集凹陷;谭庄-沈丘凹陷;南华北地区2427|962|0更新时间：2023-05-30
- 摘要：Based on observations of a large number of cores and thin sections, and the experimental analysis of vitrinite reflectance(Ro),Xray diffraction of clay minerals,scanning election microscope(SEM), this paper discusses in detail diagenetic phenomenon, sequence and evolution of the Silurian Xiaoheba Formation in the Shizhu Synclinoyium,western Hubei easternChongqing Area,It is defined that the Xiaoheba Formation currently is in the epigenetictelogenetic stage. We establish the diagenetic evolution sequence in the area and discuss the influence of diagenesis on reservoir porosity and the densification process of reservoirs. According to this study, sandstone reservoirs in the Xiaoheba Formation experienced a densification process during sedimentation, synsedimentation and eogenetic stage and a positive alteration process during the mesogenetic and telogenetic stages. When eogenetic phase ended, reservoirs in the study area had become very tight, which badly affected the development of secondary pores. Therefore, secondary pores failed to be formed in the best period of their development.关键词：关键词：成岩作用;成岩演化;致密化;小河坝组;石柱复向斜;鄂西渝东地区2394|885|0更新时间：2023-05-30
- 摘要：Taking the Carboniferous igneous reservoirs of Junggar Basin as an example, the authors examine the origin and characteristics of fractures in the igneous rocks by using reservoir geology, core data and conventional log data. Lithology of the igneous rocks are identified by MN cross plot. Taking the impact of fractures on porosity and permeability into consideration, we put forward methods for calculating elastic parameters of fractures. In combination with imaging log data, formation testing data and core description, we establish a composite evaluation method for fractured igneous reservoirs in this area. The study shows that the fractures feature in low Yang modulus and high Poisson ratio. The method can meet the needs of studying fractured igneous reservoirs in this area.关键词：关键词：弹性参数;裂缝;成像测井;测井评价;火成岩;石炭系;准噶尔盆地2552|1005|0更新时间：2023-05-30
- 摘要：The PermoCarboniferous source rocks are widely distributed in the Sulige region. With a flat regional structural relief and poor reservoir poroperm characteristics as background, the secondary migration of gas in the region is mainly driven by gas expansion. Gas charging potential is not only depended on the amount of gas expelled from the source rocks but also closely related to the thickness and porosity of the reservoirs to be charged. The author therefore proposes in the paper a quantitative method for gas charging potential evaluation by using reservoir charging index (RCI). Experimental results of two phase (gaswater) flow were also used to determine the evaluation standards of RCI at high, mediocre and low gas charging potentials respectively. For the PermoCarboniferous in Sulige Region, effective gas charging mainly occurs between the Carboniferous Benxi Formation and the 8th member of the Permian Shihezi Formation. Their RCI values are in the range from 0.4 to 0.6, indicating a medium to high gas charging potential as a whole.关键词：关键词：储层;气体膨胀;储层天然气充注指数;石炭-二叠系;苏里格气田2823|1000|0更新时间：2023-05-30
- 摘要：This paper makes a study of the mixed clasticcarbonate deposits widely distributed in the lower part of the 1st member of the Shahejie Formation, Huanghua Depression. Since there is little research on this kind of mixed deposits, it is hard to identify sedimentary facies, reservoir distribution, poolforming elements and their distribution patterns. Therefore, by examining sedimentary microfacies and based on the sequence stratigraphic framework of the study area, we made a comprehensive study of petrologic features, genetic types and evolutionary patterns of mixed clasticcarbonate deposits and the controlling effect of sequence stratigraphic framework on their distribution. According to this study, we recognize four types of mixed deposits: parent material mixing, mixing due to gradual facies change, insitu mixing and gravity flow mixing. The mixed deposits are highly developed in lowstand system tract, but poorly developed in highstand and transgression system tracts. The lower part of the 1st member of the Shahejie Formation, Huanghua Depression, is a typical example of modern mixed clasticcarbonate deposits. Results from this study can provide thoughts and foundations for further exploration and development in the study area.关键词：关键词：层序地层格架;成因类型;演化模式;混合沉积;沙河街组;黄骅坳陷;渤海湾盆地2801|795|0更新时间：2023-05-30
- 摘要：There were many hydrocarbon plays with long geological time span in the western part of Pearl River Mouth Basin. The major plays were different from one structural zone to another. Starting from exploring reasons for the differences of hydrocarbon play distribution, we analyze characteristics, distribution patterns and main controlling factors of the upper, middle and lower plays in the Hanjiang Formation and Wenchang Formation in the western part of this basin. On the basis of above findings, we establish three poolforming patterns: 1) “longdistance lateral migration and accumulation in anticlines” for the Neogene Zhujiang Formation in the uplift; 2) “vertical migration and accumulation in secondary structure and lithologic reservoirs” for the Neogene Zhujiang Formation; 3) “vertical migration and accumulation in composite reservoirs” for the faulted slope belt in the sag. Three favorable plays are recognized: 1) lowamplitude anticline reservoir and relevant secondary lowresistivity reservoirs in the Qionghai uplift; 2) fault block reservoirs in the 2nd member of the Zhujiang Formation of the faulted slope belt in the WenchangB sag; 3) subtle stratigraphiclithologic reservoirs in the northern slope of the WenchangB sag. The predictions are proved by drilling with the discovery of three commercial oilfields at the X structure in the downthrow wall of the south fault belt, the Y structure in the Qionghai uplift and the Z structure in the Qionghai uplift.关键词：关键词：成藏组合;成藏模式;琼海凸起;文昌凹陷;珠江口盆地西部2619|965|0更新时间：2023-05-30
- 摘要：Based on the study of compaction, overpressure and oil potential at the deepest burial depth in Early Cretaceous were restored for the Yanchang Formation, eastern Gansu Province, Ordos Basin. We carefully examine the relationship between vertical distribution of overpressure and testing production. The results show that the oil flow is relatively higher where it is close to the oil source and has lower overpressure, indicating that a close relationship between overpressure and oil distribution. Distribution of oil potential in the main period of accumulation shows that oil tends to migrate and accumulate at the lower oil potential area which coincides with current oil distribution. From this study, we believe that, under the condition of low permeability of reservoirs, fluid dynamics in the main period of accumulation is the main controlling factor for oil migration and accumulation.关键词：等效深度法;过剩压力;油势;流体动力学;石油运移;陇东地区;鄂尔多斯盆地2442|763|0更新时间：2023-05-30
- 摘要：Gas reservoirs in the Upper Triassic Xujiahe Formation, southwestern Sichuan Province are characterized by low resistivity, complex genetic types and complex gaswater relationships, which make them hard to identify. Using data from core analysis, logging, structures, testing and logging responses, we thoroughly examine genetic pattern of low resistivity gas reservoirs in the study area from macro and microviews. According to this study, main controlling factors responsible for the development of these low resistivity gas reservoirs are: 1) muddy sandstone reservoirs with low porosity and permeability developing in the context of lowamplitude structures; 2) complex pore configurations, high water saturation, and high formation water salinity; 3) lowenergy sedimentary environment resulting in fine particles in reservoirs, high mud content, some clay minerals with conductivity and enrichment of conductive minerals in certain areas. Reservoir quality has a negative correlation with resistivity.关键词：关键词：孔隙结构;低幅构造;成因机制;低阻气层;沉积环境;须家河组;川东南地区2720|592|0更新时间：2023-05-30
- 摘要：The Yingcheng Formation and the Shahezi Formation in the Shiwu oilfield harbor oil/gas reservoirs of low to ultralow permeability in complex faultblocks. Single thin sand bodies there distribute unevenly and are compartmentalized by faults in certain places. Fluids of various types inside the reservoirs are controlled both by structure and lithology. Most wells drilled in the field have to be fractured before production with only a few can produce by natural energy. Performance of production test in single wells shows a low formation volume factor, a bigger startup pressure gradient (meaning a low production), and a faster production declining rate for wells in natural depletion. The results also suggest that wells producing both oil and gas have a better performance than those produce oil only, and gas wells are the most productive ones. To tackle these problems, we proposed a comprehensive development strategy which includes the following aspects. The first is performing a separatelayer fine reservoir description based on separatelayer fracturing, testing and evaluating. The second is increasing single well production capacity by commingled production after separatelayer fracturing and supplementing formation energy with wholelayer water injection followed by separatelayer water injection. The third is carrying out water injection pilot with irregular well patterns in the selected favorable fault blocks at first and then implementing the successful experience to other areas. The fourth is performing largescale fracturing in gas/oilbearing layers and CO2 huff-n’puff in single oil well with low gasoil ratio.关键词：关键词：试采动态;开发对策;复杂断块;超低渗油藏;十屋油田;松辽盆地2366|898|0更新时间：2023-05-30
- 摘要：:Log technique have been employed in the recognition of many meaningful geological events. However, the subtle changes of logs are seldom recognized and used, thus limiting the accuracy and reliability of interpretation. The issue could be tackled be establishing genetic relationships between the variety of important geological events and logs, and that between geological evolution and the vertical and horizontal changes of the logs based on a comprehensive study on geological responses and the combined features of associated logs. The method is used to identify geological events of clastic and carbonate rocks as well as their formation mechanism. Based on an analysis of the variety of geological events, an approach for identifying geological events of clastic rocks is proposed. Through identification and tracing of isogenesis geologic boundaries, an approach for identifying contemporaneous carbonate rocks of different facies. Approaches for identifying geological events of these two kinds of rocks are different as they vary in lithology and genesis. Their major differences include tracing basis and log responses of geologic boundary, and corresponding relationships between log data and geologic boundaries. Application of the abovementioned methods in Dagang Oilfield, Puguang Gasfield and many other fields in Australia has successfully solved the problem of identifying geologic boundaries.关键词：关键词：地质界面;地质事件;碎屑岩;碳酸盐岩;测井技术2012|986|0更新时间：2023-05-30
- 摘要：The reasons for anomalous pore pressure are analyzed in this paper. The methods of equivalent depth to predict pore pressure from well logging data and Fillippone’ formula based on seismic velocity are introduced and compared with the results from MDT pressure data. The results of prediction of pore pressure from well sonic data in the Tahe oilfield TPT area shows that this area pressure coefficient change from 1.0 to 1.2, can be classified as normal pressure system. The maximum error between MDT and predicted pore pressure by Fillippone’ formula reaches 5% as predictied pore pressure by equivalent depth method reaches 15%, so Fillippone’ formula has high precision and reliability than the equivalent depth method. This study show that prediction of pore pressure using seismic velocity can predict the layer pressure which embodies the pressure change trend of a heavy layer and design the mud density before drill. It can also can improve the drill productivity and approve the support for safe drill.关键词：关键词：欠压实;速度谱;压力系数;压力预测;异常地层压力;塔河油田2664|706|0更新时间：2023-05-30
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