四川盆地威远构造震旦系灯影组气烟囱特征及其地质意义

doi:10.11743/ogg20160510

摘要/Abstract

摘要： 四川盆地威远构造震旦系灯影组气藏充满度仅为25%，与早寒武世拉张槽相隔的高石梯-磨溪构造灯影组则为充满度近100%的特大型整装气田。两者的区域背景和生储盖组合条件相近，但气田充满度出现很大差异。威远构造2D和3D地震剖面存在较多震旦系—三叠系管状异常特征，有的出露地表或隐伏浅层之下，分析可能为气烟囱特征。其主要特征包括：①受气烟囱效应影响，威远构造地表三叠系嘉陵江组出露附近河流中有大量气苗；②上覆寒武系遇仙寺组气藏、洗象池组气藏及二叠系阳新统气藏的天然气非烃气体中的氮、氩、氦成分与威远气田震旦系灯影组天然气成分相似，具有灯影组气藏天然气上窜特征；③威远构造震旦系—二叠系压力系数均为1.0左右，高石梯-磨溪构造灯影组压力系数也为1.0左右，但其上覆层位均为超压。威远构造气烟囱表明，震旦系灯影组气藏封闭系统基本失效，保存条件较差，天然气垂向运移，直接影响现今气藏的规模。

关键词: 气烟囱, 天然气, 灯影组, 威远构造, 四川盆地

Abstract: Fullness coefficient of the Upper Sinian Dengying Fm gas reservoir in the Weiyuan Structure is only 25%,while that in the Gaoshiti-Moxi Structure separated with the former by the Cambrian intracratonic sag is approximately 100%.Though the Dengying Fm in the two structures have similar regional background and source-reservoir-cap assemblage conditions,they have large differences in the fullness coefficient of natural gas reservoir.Abnormal tubular characteristics can be found in the Sinian-Triassic on 2D and 3D seismic profiles of the Weiyuan Structure.Some of them expose on the surface or are subtle under the shallow layer.They are supposed to be the characteristics of "gas chimney".Their major features are as follows:①Affected by the gas chimney,a large amount of gas seepages can be found in rivers near the Lower Triassic Jialingjiang Formation outcrops of the Weiyuan Structure; ②Non-hydrocarbon gases components such as nitrogen,argon and helium of the gas reservoirs in the Upper Cambrian Yuxiansi Formation,Xixiangchi Formation and Lower Permian Yangxin Formation are similar to the Upper Sinian Dengying Formation in Weiyuan,indicating the upward channeling of gas in the Upper Sinian Dengying Fm; ③ Although the pressure coefficient is 1.0 in the Dengying Formation of Gaoshiti-Moxi Structure,the overlying strata have overpressure.The existence of gas chimneys in Weiyuan shows that the seal system of the Upper Sinian Dengying Fm gas reservoir is basically failed,thus the sealing conditions are poor.The vertical migration of natural gas directly affects the scale of the current gas reservoir of the Weiyuan Structure.

Key words: gas chimney, natural gas, Dengying Formation, Weiyuan Structure, Sichuan Basin

中图分类号:

TE122.3

梁霄,刘树根,夏铭,等. 四川盆地威远构造震旦系灯影组气烟囱特征及其地质意义[J]. 石油与天然气地质, 2016, 37(5): 702-712. doi: 10.11743/ogg20160510 Liang Xiao,Liu Shugen,Xia Ming,et al. Characteristics and geological significance of gas chimney of the Sinian Dengying Formation in the Weiyuan Structure,Sichuan Basin[J]. Oil & Gas Geology, 2016, 37(5): 702-712. doi: 10.11743/ogg20160510

参考文献

[1] 钟勇,李亚林,张晓斌,等.四川盆地下组合张性构造特征[J].成都理工大学学报(自然科学版),2013,05:498-510. Zhong Yong,Li Yalin,Zhang Xiaobin,et al.Feathres of extensional structure in pre-Sinian to Cambrian strata,Sichuan Basin,China[J].Journal of Chengdu University of Technology:Science & Technology Edition,2013,05:498-510.
[2] 包茨,杨先杰,李登湘.四川盆地地质构造特征及天然气远景预测[J].天然气工业,1985,5(4):1-11. Bao Ci,Yang Xianjie,Li Dengxiang.Characteristic of geological structure and predication of gas prospect of Sichuan Basin[J].Natural Gas Industry,1985,5(4):1-11.
[3] 甘昭国,梁恩宇.四川盆地褶皱形成时间及其对油气聚集的控制[J].天然气工业,1988,8(4):1-6. Gan Zhaoguo,Liang Enyu.Formation time of the folds in Sichuan Basin and its control on oil and gas accumulations[J].Natural Gas Industry,1988,8(4):1-6.
[4] 刘顺.四川盆地威远背斜的形成时代及形成机制[J].成都理工学院学报,2001,28(4):340-343. Liu Shun.Formation time and formation mechanism of the Weiyuan anticline in Sichuan Basin[J].Journal of Chengdu University of Technology,2001,28(4):340-343.
[5] 刘树根,孙玮,赵异华,等.四川盆地震旦系灯影组天然气的差异聚集分布及其主控因素[J].天然气工业,2015,01:10-23. Liu Shugen,Sun Wei,Zhao Yihua,et al.Differential accumulation and distribution of natural gas and their main controlling factors in the Upper Sinian Dengying Formation,Sichuan Basin[J].Natural Gas Industry,2015,35(1):10-23.
[6] Cartwright J A,Huuse M,Aplin A.Seal bypass systems[J].AAPG Bullutin,2007,91(8):1141-1166.
[7] 张为民,李继亮,钟嘉猷,等.气烟囱的形成机理及其与油气的关系探讨[J].地质科学,2000,04:449-455. Zhang Weimin,Li Jijiang,Zhong Jiayou,et al.A study on formation mechanism of gas-chimney and relationship with petroleum[J].Scientia Geologica Sinica,2000,04:449-455.
[8] 何家雄,黄火尧,陈龙操.莺歌海盆地泥底辟发育演化与油气运聚机制[J].沉积学报,1994,(3):120-129. He Jiaxiong,Huang Huoyao,Chen Longcao.The formation and evolution of mud diapir and its relationship with hydrocarbon accumulation mechanism in Yinggehai Basin[J].Acta Sedimentologica Sinica,1994,03:120-129.
[9] 何家雄,陈伟煌,钟启祥.莺歌海盆地泥底辟特征及天然气勘探方向[J].石油勘探与开发,1994,06:6-9,113. He Jiaxiong,Chen Weihuang,Zhong Qixiang.Mud diaper characteristic and natural gas prospects in Yinggehai Basin[J].Petroleum Exploration and Development,1994,06:6-9,113.
[10] 何家雄,祝有海,翁荣南,等.莺歌海盆地油气渗漏系统及油气勘探前景[J].西南石油大学学报(自然科学版),2010,01:1-10+189. HeJiaxiong,Zhu Youhai,Weng,Rongnan,et al.Oil and gas leakage system and the prospects for oil and gas exploration,Yinggehai Basin[J].Journal of Southwest Petroleum University:Science & Technology Edition,2010,01:1-10,189.
[11] Sun Y B,Wu S G,Dong D D,et al.Gas hydrates associated with gas chimneys in fine-grained sediments of the northern South China Sea[J].Marine Geology,2012:311-314,32-40.
[12] Loseth H,Gading M,Wensaas L.Hydrocarbon leakage interpreted on seismic data[J].Marine and Petroleum Geology,2009,26:1304-1319.
[13] Nourollah H,Keetley J.Gas chinmney identification through seismic attribute analysis in Australia[J].The Leading Edge,2010,29(6):896-901.
[14] Hustoft S,Bunz S,Mienert J.Three-dimensional seismic analysis of the morphology and spatial distribution of chimneys beneath the Nyegga pockmark field,offshore mid-Norway[J].Basin Research,2010,22:465-480.
[15] Heggland R.Detection of gas migration from a deep source by the use of exploration 3D seismic data[J].Marine Geology,1997,137:41-47.
[16] Hansen J P V,Cartwright J A,Huusew M,et al.3D seismic expression of fluid migration and mud remobilization on the Gjallar Ridge,offshore mid-Norway[J].Basin Research,2005,17:123-139.
[17] 梁全胜,刘震,常迈,等.柴达木盆地三湖地区第四系气藏形成与"烟囱效应"[J].新疆石油地质,2006,02:156-159. Liang Quansheng,Liu Zhen,Chang Mai,et al.Gas chimney effect and formation of Quaternary gas pool in Sanhu area,Qaidam Basin[J].Xinjiang Petroleum Geology,2006,02:156-159.
[18] 杨瑞召,李洋,庞海玲,等.倾角导向体控制的气烟囱识别技术及其在海拉尔盆地贝尔凹陷中的应用[J].现代地质,2013,01:223-230. Yang Ruizhao,Li Yang,Pang Hailing,et al.3D seismic chimney detection technology based on dip steering and its application on Buir Sag of Hailar Basin[J].Geoscience,2013,01:223-230.
[19] 杨涛涛,吕福亮,王彬,等.琼东南盆地南部深水区气烟囱地球物理特征及成因分析[J].地球物理学进展,2013,(5):2634-2641. Yang Taotao,Lv Fuliang,Wang Bin,et al.Geophysical characteristics and genetic mechanism of the gas chimney in deep water area of southern Qiongdongnan Basin[J].Progress in Geophysics 2013,05:2634-2641.
[20] 徐永昌,王先彬,吴仁铭,等.天然气中稀有气体同位素[J].地球化学,1979,04:271-282. Xu Yongchang,Wang Xianbin,Wu Renming,et al.Rare gas isotopic composition of natural gases[J].Geochimica,1979,04:271-282.
[21] 魏国齐,王东良,王晓波,等.四川盆地高石梯-磨溪大气田稀有气体特征[J].石油勘探与开发,2014,05:533-538. Wei Guoqi,Wang Dongliang,Wang Xiaobo,et al.Characteristics of noble gases in the large Gaoshiti-Moxi gas field in Sichuan Basin[J].Petroleum Exploration and Development,2014,05:533-538.
[22] 戴金星.威远气田成藏期及气源[J].石油实验地质,2003,05:473-480. Dai Jinxing.Pool-forming period sand gas sources of Weiyuan gas field[J].Petroleum Geology and Experiment,2003,25(05):473-480.
[23] 孙玮,刘树根,马永生,等.四川盆地威远-资阳地区震旦系油裂解气判定及成藏过程定量模拟[J].地质学报,2007,08:1153-1159. Sun Wei,Liu Shugen,Ma Yongsheng,et al.Determination and quantitative simulation of gas pool formation process of Sinian cracked gas in Weiyuan-Ziyang area,Sichuan Basin[J].Acta Geologica Sinica,2007,81(8):1153-1159.
[24] 刘树根,马永生,孙玮,等.四川盆地威远气田和资阳含气区震旦系油气成藏差异性研究[J].地质学报,2008,03:328-337. Liu Shugen,Ma Yongsheng,Sun Wei,et al.Studying on the differences of Sinian natural gas pools between Weiyuan Gas Fieldand-Ziyang gas-bronearea,Sichuan Basin[J].Acta Geologica Sinica,2008,82(3):328-337.
[25] 孙玮,刘树根,王国芝,等.四川威远震旦系与下古生界天然气成藏特征[J].成都理工大学学报(自然科学版),2010,05:481-489. Sun Wei,Liu Shugen,Wang Guozhi,et al.Characteristics of gas formatted from Sinian to Lower-Paleozoicin Weiyuan area of Sichuan Basin,China[J].Journal of Chengdu University of Technology:Science & Technology Edition,2010,37(5):481-489.
[26] 赵景续.一个岩溶型气藏-威远气田阳新统气藏分析[J].中国岩溶,1988,S2:203-209. Zhao Jingxu.A karst gas reservoir-analysis of Yangxin gas reservoir in the Weiyuan Gas Field[J].Carsologica Sinica,1988,S2:203-209.