川南云锦地区茅口组储集层溶蚀期次及模式

doi:10.7657/XJPG20220505

新疆石油地质 ›› 2022, Vol. 43 ›› Issue (5): 537-545.doi: 10.7657/XJPG20220505

川南云锦地区茅口组储集层溶蚀期次及模式

何钊¹(), 高兆龙²(), 李国蓉¹, 何赛¹^,³, 莫国宸¹, 田家奇¹, 李肖肖¹

1.成都理工大学能源学院,成都 610059
2.中国石油西南油气田公司勘探开发研究院,成都 610041
3.四川中成煤田物探工程院有限公司,成都 610072

收稿日期:2022-01-11 修回日期:2022-03-08 出版日期:2022-10-01 发布日期:2022-09-22
通讯作者: 高兆龙 E-mail:1398219032@qq.com;gaozhaolong@petrochina.com.cn
作者简介:何钊（1998-）,男,四川南充人,硕士研究生,储层地质学,（Tel）13890400467（E-mail） 1398219032@qq.com
基金资助:
国家科技重大专项(2017ZX05005-001-010)

Dissolution Stage and Pattern of Reservoirs in Maokou Formation in Yunjin Area, Southern Sichuan Basin

HE Zhao¹(), GAO Zhaolong²(), LI Guorong¹, HE Sai¹^,³, MO Guochen¹, TIAN Jiaqi¹, LI Xiaoxiao¹

1. School of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, China
2. Research Institute of Exploration and Development, Southwest Oil and Gas Field Company, PetroChina, Chengdu, Sichuan 610041, China
3. Sichuan Zhongcheng Institute of Coalfield Geophysical Engineering, Chengdu, Sichuan 610072, China

Received:2022-01-11 Revised:2022-03-08 Online:2022-10-01 Published:2022-09-22
Contact: GAO Zhaolong E-mail:1398219032@qq.com;gaozhaolong@petrochina.com.cn

摘要/Abstract

摘要：

为确定川南云锦地区中二叠统茅口组碳酸盐岩储集层成因,通过岩心及薄片观察、岩石学特征分析和同位素地球化学特征分析,对溶蚀作用期次与机制开展研究。云锦地区茅口组储集层存在3期溶蚀作用,表生期大气淡水岩溶作用的流体为大气降水,东吴运动期裂缝为渗流通道,表现为由裂缝向溶蚀缝洞和岩溶洞穴转化,不整合面和古地貌为主要控制因素;早成岩期热液溶蚀作用,与峨眉山玄武岩喷发相关的岩浆期后幔源深部热液,沿断裂上移到茅口组内部并进行改造,鞍形白云石发育;晚成岩期埋藏溶蚀作用流体为二叠系碳酸盐岩内部流体与泥岩成岩转变流体的混合酸性流体,在上覆地层压力下,燕山运动期裂缝和缝合线为流体渗流通道,沿裂缝和缝合线溶蚀缝洞发育。整体而言,表生期大气淡水岩溶作用是研究区储集层形成的决定性成岩作用,早成岩期热液溶蚀作用和晚成岩期埋藏溶蚀作用可以形成少量溶蚀孔洞和溶蚀缝,提高储集层的储集性能。

关键词: 四川盆地, 云锦地区, 茅口组, 储集层, 溶蚀作用, 溶蚀期次, 同位素地球化学

Abstract:

In order to determine the genesis of the carbonate reservoirs in the Middle Permian Maokou formation in Yunjin area, southern Sichuan basin, the dissolution stage and mechanism were investigated through core and thin section observations, petrological analysis and isotopic geochemical analysis. There are three stages of dissolution in the reservoirs of the Maokou formation in the study area: (1) atmospheric water karstification in the supergene stage, with atmospheric precipitation as the karstification fluid and the fractures formed in the Dongwu movement period as the flow channels, which showed the transformation from fractures to dissolution fractures/vugs and karst cavities, mainly under the control of unconformity surface and paleomorphology; (2) hydrothermal dissolution in the early diagenetic stage, when the deep mantle-derived hydrothermal fluid in the post-magmatic stage related to the eruption of the Emeishan basalt moved up along the fault to the interior of the Maokou formation and reformed the formation, and saddle-shaped dolomite was developed; and (3) burial dissolution in the late diagenetic stage, when the dissolution fluid was mainly the mixed acid fluid composed of the fluid in Permian carbonate rock and the fluid in mudstone diagenetic transition, and the flow channels were mainly the fractures and stylolite formed in the Yanshan movement period, with dissolution fractures/vugs developed along fractures and stylolite. On the whole, the atmospheric water karstification in the supergene stage is the decisive diagenesis for the formation of the reservoirs in the study area, and the hydrothermal dissolution in the early diagenetic stage and the burial dissolution in the late diagenetic stage allowed the formation of a small amount of dissolution pores/vugs and dissolution fractures, which could improve the storage performance of the reservoirs.

Key words: Sichuan basin, Yunjin area, Maokou formation, reservoir, dissolution, dissolution stage, isotopic geochemistry

中图分类号:

TE122.221

何钊, 高兆龙, 李国蓉, 何赛, 莫国宸, 田家奇, 李肖肖. 川南云锦地区茅口组储集层溶蚀期次及模式[J]. 新疆石油地质, 2022, 43(5): 537-545.

HE Zhao, GAO Zhaolong, LI Guorong, HE Sai, MO Guochen, TIAN Jiaqi, LI Xiaoxiao. Dissolution Stage and Pattern of Reservoirs in Maokou Formation in Yunjin Area, Southern Sichuan Basin[J]. Xinjiang Petroleum Geology, 2022, 43(5): 537-545.

图/表 8

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川南云锦地区茅口组储集层溶蚀期次及模式

Dissolution Stage and Pattern of Reservoirs in Maokou Formation in Yunjin Area, Southern Sichuan Basin

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