四川盆地震旦系油气地质条件及勘探前景分析
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摘要
通过对四川盆地震旦系40多年的钻探情况分析后认为,震旦系勘探程度低,对四川盆地加里东古隆起和盆地周边一些高陡构造的钻探均未获得气藏。四川盆地震旦系烃源条件优越、封盖条件好,储层好,分布广泛,具备形成大气田的地质条件。四川盆地震旦系第一个成油期是加里东期,海西期油气被破坏;印支期烃源二次生烃并形成古油藏,古隆起对油气捕集有着重要的意义。喜马拉雅期前由于持续埋深、温度增高、油裂解气的影响形成异常高压,天然气溶于水中形成水溶气;挤压隆升过程中,造成的油气再分配和水溶气的脱溶,最终形成现今的气藏和含气区。该文通过对四川盆地震旦系的油气成藏条件分析,提出川东华蓥山地区和川西北天井山古隆起是除乐山─龙女寺古隆起外未来震旦系勘探的有利地区。
The exploration degree of Sinian in the Sichuan Basin is low according to drilled information analysis.The drilled wells distribute on Leshan-Longnüsi paleo-uplift area and orogenic belt which is around the basin,but they almost failed.The source rock and caprock are good and have good geological conditions to form large gas field.The first oil generation period was in Caledonian and the oil was destroyed to bitumen in Hercynian.The second oil generation was in Indosinian.The Leshan-Longnvsi paleo-uplift was important to oil accumulation in this period.The oil was thermal cracked to gas by deep buried before Himalayan.It also formed abnormal high pressure and induced gas dissolving into water.During the uplift processes,due to the redistribution of gas and gas released from formation water,the gas field and gas-bearing areas were finally formed.Through analyzing the reservoir forming conditions of Sinian in the Sichuan Basin,this paper points out that the paleo-structures before Himalayan and Tianjingshan paleo-uplift in Caledonian should be the favorable exploration areas in the future.
The exploration degree of Sinian in the Sichuan Basin is low according to drilled information analysis.The drilled wells distribute on Leshan-Longnüsi paleo-uplift area and orogenic belt which is around the basin,but they almost failed.The source rock and caprock are good and have good geological conditions to form large gas field.The first oil generation period was in Caledonian and the oil was destroyed to bitumen in Hercynian.The second oil generation was in Indosinian.The Leshan-Longnvsi paleo-uplift was important to oil accumulation in this period.The oil was thermal cracked to gas by deep buried before Himalayan.It also formed abnormal high pressure and induced gas dissolving into water.During the uplift processes,due to the redistribution of gas and gas released from formation water,the gas field and gas-bearing areas were finally formed.Through analyzing the reservoir forming conditions of Sinian in the Sichuan Basin,this paper points out that the paleo-structures before Himalayan and Tianjingshan paleo-uplift in Caledonian should be the favorable exploration areas in the future.
引文
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2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
3张林,魏国齐,韩龙等.四川盆地震旦系—下古生界高过成熟度烃源岩评价[J].石油实验地质,2008,30(3):286~291
4王兴志,黄继祥,侯方浩等.四川资阳及邻区震旦系灯影组储层段沉积及层序地层学特征[J].西南石油学院学报,1996,18(3):1~9
5徐世琦,洪海涛,李翔.四川盆地震旦系油气成藏特征与规律[J].天然气勘探与开发,2002,25(4):1~5
6吕延防,付广,于丹.中国大中型气田盖层封盖能力综合评价及其对成藏的贡献[J].石油与天然气地质,2005,26(6):742~745
7黄籍中,冉隆辉.四川盆地震旦系灯影灰岩黑色沥青与油气勘探[J].石油学报,1989,10(1):27~36
8张林,魏国齐,吴世祥等.四川盆地震旦系—下古生界沥青产烃潜力及分布特征[J].石油实验地质,2005,27(3):276~280
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,2008,9(3):293~300
11王兰生.对目前国内油气无机成因理论的几点看法[J].石油勘探与开发,2006,33(6):772~775
12刘德良,宋岩,薛爱民等.四川盆地构造与天然气聚集区带综合研究[M].石油工业出版社,2000.59~65
13王兰生,苟学敏,刘国瑜等.四川盆地天然气的有机地球化学特征及其成因[J].沉积学报,1997,15(2):49~53
14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,2008,82(3):328~337
15王兰生,韩克猷,谢邦华等.龙门山推覆构造带北段油气田形成条件探讨[J].天然气工业,2005(增刊):1~5
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