四川威远震旦系与下古生界天然气成藏特征
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摘要
四川盆地威远气田是唯一的在震旦系灯影组、寒武系洗象池组和奥陶系宝塔组均获得气藏和气井的地区。通过对比威远气田震旦系、寒武系和奥陶系天然气成分特征,得出奥陶系天然气与震旦-寒武系特征存在差异,暗示是两套不同的烃源体系,前者主要供烃来源是下志留统,后者供烃来源主要是下寒武统。但威远气田寒武系和奥陶系储集性能先天不好,加之加里东期构造抬升剥蚀破坏了保存条件,制约了天然气的大规模成藏。在此基础上,通过对四川盆地下组合的几个重点勘探地区威远-资阳-安平店、高石梯-丁山构造震旦系天然气成藏条件的对比分析,在烃源、盖层和储集层条件相似的情况下对应的最终成藏结果却不同,这与前期古油气藏的分布有关,也与后期隆升构造调整有关,这些都是制约震旦系的成藏关键,也说明四川盆地震旦系与下古生界(下组合)勘探的苛刻性和复杂性。
The Weiyuan gas field in Sichuan Basin is the only place,where the gas pools and gas wells were found in Dengying Formation of Sinian and Baota Formation of Ordovician.By comparing the components of the natural gas from Sinian,Cambrian and Ordovician in the Weiyuan gas field,the paper finds that there are differences between the natural gas from Sinian-Cambrian and that from Ordovician,and also reveals that there are two different resource rock systems.The main resource of the former is the resource rock of Lower Silurian and the later is mainly from the resource rock of Lower Cambrian.But the reservoir rock property of Cambrian and Ordovician is innately not very well and the uplifting and denuding during Caledonian tectonic movement destroyed the preservative condition and prohibited the natural gas accumulation on a large scale.On the foundation of those researches mentioned before and by analyzing the gas accumulation condition in Sinian of critical areas (Weiyuan-Ziyang-Anpingdian,Gaoshiti-Dingshan structure),the paper finds these areas have quite different results of gas accumulation but with the similar condition of resource rocks,cap rocks and reservoir rocks.This is relevant with the former distribution of paleo-oil pools and the late regulation of tectonic uplifting,both of which are the key factors for restraining the gas accumulation of Sinian.All these reveal how rigorous and complicated to explore the gas accumulation of Sinian and Lower Palaeozoic(lower association)is in Sichuan Basin.
The Weiyuan gas field in Sichuan Basin is the only place,where the gas pools and gas wells were found in Dengying Formation of Sinian and Baota Formation of Ordovician.By comparing the components of the natural gas from Sinian,Cambrian and Ordovician in the Weiyuan gas field,the paper finds that there are differences between the natural gas from Sinian-Cambrian and that from Ordovician,and also reveals that there are two different resource rock systems.The main resource of the former is the resource rock of Lower Silurian and the later is mainly from the resource rock of Lower Cambrian.But the reservoir rock property of Cambrian and Ordovician is innately not very well and the uplifting and denuding during Caledonian tectonic movement destroyed the preservative condition and prohibited the natural gas accumulation on a large scale.On the foundation of those researches mentioned before and by analyzing the gas accumulation condition in Sinian of critical areas (Weiyuan-Ziyang-Anpingdian,Gaoshiti-Dingshan structure),the paper finds these areas have quite different results of gas accumulation but with the similar condition of resource rocks,cap rocks and reservoir rocks.This is relevant with the former distribution of paleo-oil pools and the late regulation of tectonic uplifting,both of which are the key factors for restraining the gas accumulation of Sinian.All these reveal how rigorous and complicated to explore the gas accumulation of Sinian and Lower Palaeozoic(lower association)is in Sichuan Basin.
引文
[1]黄显忠,文明,曾光,等.威远气田下古生界含油气评价与挖潜研究[R].成都:四川石油管理局,2006.
[2]黄籍中.“源控论”再认识以四川盆地天然气勘探为例[J].海相油气地质,1996,3(2):1-5.
[3]黄籍中,陈盛吉.震旦系气藏形成的烃源地球化学条件分析[J].天然气地球科学,1993(4):16-20.
[4]戴金星.威远气田成藏期及气源[J].石油实验地质,2003,25(5):473-480.
[5]戴金星.威远气田的气源以有机成因气为主与张虎权等同志再商榷[J].天然气工业,2006,26(2):16-18.
[6]尹宏,代宗仰,郭伟.川中-川南过渡带奥陶系成藏条件分析[J].内蒙古石油化工,2006(11):133-134.
[7]陈宗清.四川盆地中二叠统茅口组天然气勘探[J].中国石油勘探,2007(5):1-11.
[8]曾庆辉,钱玲,刘德汉,等.富有机质的黑色页岩和油页岩的有机岩石学特征与生、排烃意义[J].沉积学报,2006,24(1):113-122.
[9]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,2007,81(8):1153-1159.
[10]刘若冰,田景春,魏志宏,等.川东南地区震旦系-志留系下组合有效烃源岩综合研究[J].天然气地球化学,2006,17(6):824-828.
[11]宋文海.乐山-龙女寺古隆起大中型气田成藏条件研究[J].天然气工业,1996,16(增刊):13-26.
[12]徐世琦,代宗仰,蒋小光,等.古隆起区带寒武系洗象池群成藏条件与勘探前景分析[J].天然气勘探与开发,2006,29(4):4-8.
[13]王兴志,穆曙光,方少仙,等.四川盆地西南部震旦系白云岩成岩过程中的孔隙演化[J].沉积学报,2000,18(4):549-554.
[14]许效松,万方,尹福光,等.奥陶系宝塔组灰岩的环境相、生态相与成岩相[J].矿物岩石,2001,21(3):64-68.
[15]姚建军,郑浚茂,宁宁,等.四川盆地高石梯磨溪构造带震旦系含油气系统研究[J].天然气地球科学,2002,13(5/6):74-79.
[16]刘树根,孙玮,邓宾,等.四川盆地晚白垩世以来的构造隆升作用与天然气成藏[J].天然气地球化学,2008,19(3):293-300.
[2]黄籍中.“源控论”再认识以四川盆地天然气勘探为例[J].海相油气地质,1996,3(2):1-5.
[3]黄籍中,陈盛吉.震旦系气藏形成的烃源地球化学条件分析[J].天然气地球科学,1993(4):16-20.
[4]戴金星.威远气田成藏期及气源[J].石油实验地质,2003,25(5):473-480.
[5]戴金星.威远气田的气源以有机成因气为主与张虎权等同志再商榷[J].天然气工业,2006,26(2):16-18.
[6]尹宏,代宗仰,郭伟.川中-川南过渡带奥陶系成藏条件分析[J].内蒙古石油化工,2006(11):133-134.
[7]陈宗清.四川盆地中二叠统茅口组天然气勘探[J].中国石油勘探,2007(5):1-11.
[8]曾庆辉,钱玲,刘德汉,等.富有机质的黑色页岩和油页岩的有机岩石学特征与生、排烃意义[J].沉积学报,2006,24(1):113-122.
[9]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,2007,81(8):1153-1159.
[10]刘若冰,田景春,魏志宏,等.川东南地区震旦系-志留系下组合有效烃源岩综合研究[J].天然气地球化学,2006,17(6):824-828.
[11]宋文海.乐山-龙女寺古隆起大中型气田成藏条件研究[J].天然气工业,1996,16(增刊):13-26.
[12]徐世琦,代宗仰,蒋小光,等.古隆起区带寒武系洗象池群成藏条件与勘探前景分析[J].天然气勘探与开发,2006,29(4):4-8.
[13]王兴志,穆曙光,方少仙,等.四川盆地西南部震旦系白云岩成岩过程中的孔隙演化[J].沉积学报,2000,18(4):549-554.
[14]许效松,万方,尹福光,等.奥陶系宝塔组灰岩的环境相、生态相与成岩相[J].矿物岩石,2001,21(3):64-68.
[15]姚建军,郑浚茂,宁宁,等.四川盆地高石梯磨溪构造带震旦系含油气系统研究[J].天然气地球科学,2002,13(5/6):74-79.
[16]刘树根,孙玮,邓宾,等.四川盆地晚白垩世以来的构造隆升作用与天然气成藏[J].天然气地球化学,2008,19(3):293-300.
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