最新刊期
卷 15 ， 期 4 ， 1994
- 摘要：Based on the detailed statistic data of six sections from Changxingian stage to Triassic basement in Sichuan and Guizhou Provinces, five benthonic communities dominated by brachiopods on flat sea floor have been established. The relationships between the communities and the benthonic assemblsges are respectively: Lingula Community(BA1)-Qingtongia ovalis Community(BA2)-Oldhamina Community(BA3)-Peltichia Community(BA3)-Paryphella-Waagenites Community (BA4-BA5). Studied their characteristics and environmental locations, it is suggested that the factors controlling the distribution of brachiopod communities in the area are water depth, substrata, salinity and food supply.关键词：腕足类;群落;控制因素;长兴阶627|431|0更新时间：2023-05-30
- 摘要：Dolomitization of carbonate rocks of Lower Ordovician in Eastern Ordos Basin can be classified into following four types: evaporative pumping-percolative reflux dolomitization, mixed water dolomitization (early and late diagenetic stages), deep-burial compaction-hypogenic thermal brine dolomitization and tectonic hydrothermal brine dolomitization. The former is genetically associated with evaporites and possesses plenty of Cl-, Na+, Sr2+ and low Mn2+, Fe2+ and high value of δ18O, δ13C, low porosity and permeability, so it is poor reservoir rock; the mixed-water dolostone is bedded-like and poor in Cl-,Na+, Sr2+ and δ18O-value is-8.59‰, PDB, δ13C-value is-1.067‰, PDB, it has wide dispersion and typical annulus fabric under luminescence, the average values of porosity and permeability are 2.64% and 7.5×10-3μm2 respectively, thus this kind of dolostone is the main reservoir rock type; the deepburial compaction-hypogenic thermal brine dolostone (nonflaser) that-filled in deep-resoluted porosity possesses low values of δ18O and δ13C, rich H2O and CO2 inclusions, lacks of hydrocarbon fluid inclusion, can not be reservoir rock; the tectonic-hydrothermal (flaser) ferredolomite developed along tectonic cracks, the distribution is controlled by the cracks and coinside with oil and gas deposits and contains the lowest δ18O-and δ13C-values, rich in Fe2+, Mn2+, abundant in H2O-and C2O-vapour-liquid inclusions and hydrocarbon vapour-liquid fluid inclusions. Therefore this kind of rock should be an important clue for hydrocarbon exploration.关键词：沉积相;成因;沉积地球化学;矿物包裹体;白云岩化;模式;储集特征620|475|0更新时间：2023-05-30
- 摘要：The data of Carboniferous gas and water collected from East Sichuan show that the content of H2S, the dry coefficient in natural gas, the formation water mineralization and aqueous layer pressure are all related to gas enrichment. This may be the evidence in predicting favourable exploration areas of Carboniferous natural gas in East Sichuan.关键词：川东;石炭系;天然气;气水性质;分布规律696|470|0更新时间：2023-05-30
- 摘要：X1 well, a great brine well in Central Sichuan, has become a commercial brine-gas well through about 30 years brine deviopment.Based on reservoir petrophysics and regional correlation, it is thought that the fracture system of the well is an independent sealing system with well developed subsurface fractures and has enriched abundant natural gas. The driving force of the well’s water and gas production is primarily resulted by elastic expansion of the gas on the water body and pore space contraction in the system. Depanding upon the production data and meterial balance theory, it has been calculated that there would be a great deal of gas in the system. The increase in gas production of the well would be more than that of water in future. It is proposed that"finding gas by water withdrawal"can be applied to the fractured reservoir in the compacted sandstone of the UPPer Triassic in Sichuan Basin.关键词：致密砂岩;裂缝系统;排水找气;储量计算;气水比716|726|0更新时间：2023-05-30
- 摘要：The first submember of the fifth member of the Lower Ordovician Majiagou Formation in Xingkian, Shanxi Province is located at the top of a paleo-weathered crust and consists mainly of micrite and small amount of micritic dolomite. The intercalations in it contain some amountes of argillaceous rocks. The reservoir spaces are pores, caves and fractures. The primary POres are dominantly intercrystal pores; the secondary pores include intercrystal pores, solution pores and caves, bird’s eye pores, intergtavel pores; the fractures consist of structural fratures, diagenetic fractures, karst fractures and suture fractures. It is suggested that the reservoir should belong to low Permeable solution fracture-cave reservoir. The fundamental factor to effect the reservoir property is karstification.关键词：奥陶系;古岩溶;储层676|609|0更新时间：2023-05-30
- 摘要：Longchuan Basin is a continental Tertiary microbasin developed on Cambrian metomorphic basement. The deposits are mainly coarse fluviolacustrine debris. In the basin, colluvial fan, alluvial fan and fan delta are well developed.The basin can be divided into uplift-overlap belt in the southwest, fault-depression belt in the central part, fault-block belt in the mid-western part and slope overlap belt in the northwest.The Longchuan I3asin is a half-grabed controlled by comtemporaneous boundary faults formed by crest collapse. It is considered that the basin is a pull-apart and strike-slip basin resulted from multi effects through pull-apart action in the early stage, tenso-shearing in the middle stage and superimposition in the late stage under dexdral tenso-shearing mechanics. The evolution of the basin underwent rapidly faulted depression in the early stage, stable development in the middle stage and shrivelling in the late stage. In some extent, this mode can be used to explain the formation mechanism of many Tertiary microbasins in the westward of the Nujiang River in Yunnan Province.关键词：滇西;第三系;陇川盆地;拉分盆地;走滑盆地;盆地形成机制655|824|0更新时间：2023-05-30
- 摘要：Downy Precipitate appeared in several aqueous solutions under ambient condition for some time.These solutions were orgsnic acids contained in glass vessels and experimental aqueous samples gotten with silicate rock gtains dissolved in organic acid solution. The main compeition of the Precipitate was known as cement of silica after analysis. The research results show that the stability of silica in the liquid increases with the increase of acidity of the liquid, and some low-molecular-weight organic acids which could form stable ring complexes with silica could stop the cementation of silica in liquid.关键词：硅质沉淀物;低分子量有机酸;PH值;水－岩相互作用780|820|0更新时间：2023-05-30
- 摘要：The formation of NaAlCO3 (OH)2 in the. Hailar Basin was related to CO2 Pressure, and all NaAlCO3(OH)2-bearing wells are distributed in high value areas of CO2 pr essu re. Bu t it is a fact that not all CO2 reservoirs contain NaAlCO3(OH)2 since CO2 is just one of the factors to form this minerals.The CO2 in the basin is of inorganic genesis and was dominated by Yenshan magmatic activity while magmatic activity impelled organic matter to matuate and evolute. Accoriding to the coexisting relationship between CO2, NaAlCO3 (OH )2 and hydrocarbon, and the distribution of NaAlCO3(OH)2, target areas of oil and gas as well as CO2 exploration could be predicted.关键词：海拉尔盆地;碳钠铝石;CO2气690|966|0更新时间：2023-05-30
- 摘要：On the basis of the vertical variation regularities of sedimentary structures, grain size parameters,Saph discrimination numbers and sedimentary factes, the variation of fluid property of Paleogene turbidity current in the Langgu basin is quantitatively analyzed; the deposition rate function of the turbidity currents is established combined with bouma hydraulic analysis and laboratory results; the time of single turbidity current deposition is calculated by means of this function. Researches above show that the monograde bedding sandstones in this basin were deposited under torrent regime; turbidity currents gradually became tractive currents during deposition. Most of the turbidity currents ended their deposition as soon as tractive current emerges of not long after that. The turbidity currents had the characteristics of fast flow, short transportation, fast deposition and short duration.关键词：廊固盆地;早第三纪;浊流沉积;流体性质;持续时间690|699|0更新时间：2023-05-30
- 摘要：The source rocks of Ordovician carbonate rocks in the Ordos Basin are mostly Preserved in darkgrey micrite transgtessive system tracts and early-sarge high water-level system tracts. The transgressive system tracts of Fengfeng and late Majiagou stages are two major oil-generation stages.The formation of reservoir and cap rocks was mainly related to the meteoric diagenesis, Penecontemporaneous dolomitization, and condensing evaporation during the late stage of high water-level system tracts. The upward shallowing penesequence cycles within the sequences formed a series of "self-reservoiring and near-reservoiring "souroe- rsservoir-caprock complexs. Ordovician deposition in the area underwent three platform evolution Periods: gentle-slope platform, rimmed platform and open platform Periods, and formed the main sedimental pivot belt in platform margins and secondary sedimental pivot belts within the platform. It has been proved that oil and gas distribution are related to the above mentioned pivot belts.关键词：层序地层学;沉积枢纽带;碳酸盐岩;油气聚集带;鄂尔多斯;奥陶系600|369|0更新时间：2023-05-30
- 摘要：Both the compositional maturity and structural maturity of Ⅱ4-6 and Ⅳ1-4 reservoir rocks in the north Part of Shuanghe oilfield are relatively low, and the types of authigenic and clay minerats are various, pete-structural diameters and the size of pore-throats varies distinctly, microscopic anisotropy.is high and micro-potes developed wed. The considerable variation of reservoir POre structures in lateral diredion and Plenty of microdistributive pattern of oil and water lead to low oil-expulsion. The reservoirs mentioned above are predominatly type-Ⅱ and type-Ⅲ ones.关键词：孔隙结构;微观非均质性;储层评价;驱油效率;双河北块;Ⅱ4-6;Ⅳ1-4层系583|476|0更新时间：2023-05-30
- 摘要：This paper introduces a new branch of sciences-self organization of geochemistry and its application, development and study method in the realm of oil and gas geology. In addition, some current situation on self-organization of geochemistry in oil and gas reservoir is outlined such as finger-Shaped reaction front in carbonate-cemented sandstones and the formation mechanism of abnormal pressure comparment.关键词：地球化学自组织;数值模拟;伯纳德实验;反应前锋;流体封存箱605|702|0更新时间：2023-05-30
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