陈迎宾(1975-),男,内蒙古四子王旗人,高级工程师,博士,主要从事石油地质综合评价研究.E-mail:chenyb.syky@sinopec.com. |
收稿日期: 2021-03-26
修回日期: 2021-07-05
网络出版日期: 2021-11-30
Research on gas accumulation process in the 3rd sub-member of the 4th Member of the Middle Triassic Leikoupo Formation in the Western Sichuan gas field
Received date: 2021-03-26
Revised date: 2021-07-05
Online published: 2021-11-30
Supported by
The National Natural Science Foundation of China(41872122)
the Strategic Priority Research Program of the China Academy of Sciences (Class A)(XDA14010402)
综合应用盆地模拟、构造演化分析、流体包裹体测温等技术方法,对四川盆地川西气田雷四3亚段气藏烃源岩热演化及生烃史、储层成岩及物性演化史、构造圈闭和运移输导体系形成演化史等关键成藏要素进行了模拟与研究,并对各成藏条件随时空演化的匹配关系进行了综合分析。结果表明,雷四3亚段白云岩储层在(准)同生期既已形成;石羊镇、金马、鸭子河等背斜圈闭在印支晩幕构造运动中形成;历经东吴运动、印支期、燕山早期构造运动形成的关口、彭州等断裂和雷口坡组顶部不整合面共同形成了持续、畅通的纵横向油气运移系统。这些成藏条件形成时间早、空间配置关系好,为油气成藏提供了良好的运移通道和储聚空间。综合上二叠统龙潭组、中三叠统雷口坡组烃源岩热演化及生烃史,川西气田雷四3亚段气藏经历了印支末期—燕山早期古油藏原油裂解供气成藏,燕山期雷口坡组烃源岩供油与古油藏裂解供气双源供烃形成油气藏,燕山末期—喜马拉雅期气藏形成并最终定型的成藏演化过程。
陈迎宾 , 吴小奇 , 杨俊 , 周凌方 , 周小进 , 宋晓波 . 川西气田雷口坡组雷四3亚段气藏动态成藏过程[J]. 天然气地球科学, 2021 , 32(11) : 1656 -1663 . DOI: 10.11764/j.issn.1672-1926.2021.07.006
Thermal evolution and hydrocarbon generation history of source rock, reservoir diagenesis and physical property evolution history, structural trap and migration system formation and evolution history are simulated and studied through comprehensive application of basin simulation, structural evolution analysis, temperature measurement of fluid inclusions in the Western Sichuan gas field. And the matching relation of the spatial evolution of each condition for gas accumulation is further analyzed. Results show that the dolomite reservoir of the third sub-member of the fourth Member of Leikoupo Formation(Lei43) was already formed in the (quasi) contemporaneous period, the anticline traps, such as Shiyangzheng, Jinma and Yazihe, were formed in the late Indosinian tectonic movement. The faults such as Guankou and Pengzhou and the unconformity surface at the top of the Leikoupo Formation form a continuous and smooth vertical and horizontal oil and gas migration system through the Dongwu movement, Indosinian movement, early Yanshan tectonic movement. The formation time of these accumulation conditions is early and the spatial configuration relationship is good, which provides a good hydrocarbon accumulation migration channel and storage space. Based on the thermal evolution and hydrocarbon generation history of source rocks of Longtan Formation of the Upper Permian series and Leikoupo Formation of the Middle Triassic, the gas reservoir has undergone multiple stages of evolution. Formation of the third sub-member of the fourth Member of Leikoupo Formation(Lei43) gas reservoir experienced the process of late Indosinian to early Yanshanian paleo-reservoir oil cracking, oil supply from source rock of Leikoupo Formation and gas supply from ancient reservoir cracking in the Yanshan epoch. The gas reservoir was finally formed in the late Yanshanian-Himalayan period.
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