四川盆地中三叠统雷口坡组储层特征与勘探领域探讨

doi:10.3969/j.issn.1672-7703.2022.04.007

摘要/Abstract

摘要： 中三叠统雷口坡组是四川盆地重要的战略准备领域，近些年川西发现彭州气田，川西南兴探1等井获气，川中充探1等井发现致密泥灰岩非常规天然气，展示了雷口坡组良好的勘探前景。通过井震结合，对储层和天然气成藏特征等进行综合研究，形成3点认识：（1）四川盆地雷口坡组存在常规天然气和非常规天然气两个勘探领域；（2）印支期古隆起控制“双滩带”（川西龙门山障壁丘滩带和川中潟湖边缘滩带）发育和迁移，“双滩带”发育规模储层，邻近烃源中心，是常规气藏有利勘探区带；（3）川中雷三段大面积发育的潟湖相泥灰岩致密气源储一体，顶底板均为膏盐岩层封堵，构成非常规天然气成藏系统，推测川中雷三段存在连续分布的致密气藏，是值得探索的非常规天然气勘探新领域。

关键词: 四川盆地, 雷口坡组, 常规天然气, 非常规天然气, “双滩带”, 泥灰岩致密气

Abstract: The Triassic Leikoupo Formation is an important strategic preparation field for gas exploration in Sichuan Basin. In recent years,Pengzhou Gas Field has been proved in the western Sichuan Basin, gas flow has been achieved in Well Xingtan 1 in the southwestern basin,and unconventional gas reservoir has been discovered in Well Chongtan 1 in the central basin, showing good exploration prospects of Leikoupo Formation. By integrating well and seismic data, the comprehensive study on reservoir and hydrocarbon accumulation characteristics is conducted and new understanding is obtained in three aspects: (1) There are two exploration fields of conventional and unconventional gas reservoirs of Leikoupo Formation in Sichuan Basin; (2) The Indosinian paleo uplift controlled the development and migration of “double beach zones” (Longmenshan barrier mound beach zone in the Western Sichuan and lagoon marginal beach zone in the Central Sichuan Basin),in which the large-scale reservoirs were developed. The area close to the hydrocarbon source center is a favorable zone for conventional gas exploration; (3) The integrated source rock and reservoir assemblage is widely developed in lagoon facies marl in the third member of Leikoupo Formation (Lei 3 member) in the Central Sichuan Basin, forming a tight gas reservoir system sealed by gypsum rocks at the roof and floor. It is inferred that the continuously distributed tight gas reservoirs occur in Lei 3 member in the Central Sichuan Basin, which is a new field for unconventional gas exploration.

中图分类号:

TE112.2

辛勇光, 文龙, 张豪, 田瀚, 王鑫, 孙豪飞, 谢增业. 四川盆地中三叠统雷口坡组储层特征与勘探领域探讨[J]. 中国石油勘探, 2022, 27(4): 91-102.

Xin Yongguang, Wen Long, Zhang Hao, Tian Han, Wang Xin, Sun Haofei, Xie Zengye. Study on reservoir characteristics and exploration field of the Middle Triassic Leikoupo Formation in Sichuan Basin[J]. China Petroleum Exploration, 2022, 27(4): 91-102.

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