川西北地区中二叠统栖霞组热液作用及其对储层的影响

doi:10.12108/yxyqc.20190605

Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 44-53.doi: 10.12108/yxyqc.20190605

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Hydrothermal action of Middle Permian Qixia Formation in northwestern Sichuan Basin and its effect on reservoirs

YANG Yuran, ZHANG Ya, XIE Chen, CHEN Cong, ZHANG Xiaoli, CHEN Shuangling, GAO Zhaolong

Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China

Received:2019-07-15 Revised:2019-08-11 Online:2019-11-21 Published:2019-09-28

Abstract

Abstract: Deep hydrothermal fluids can improve the reservoir properties of carbonate rocks in northwestern Sichuan Basin. In order to study the effect of hydrothermal fluid on the reservoir of Middle Permian Qixia Formation in northwestern Sichuan Basin,the core and thin section observation and geochemical analysis of trace elements and strontium isotopes were analyzed. The results show that:(1)The reservoir of Middle Permian Qixia Formation was reformed by deep hydrothermal fluid. Hydrothermal minerals such as saddle-shaped dolomite,pyrite,chlorite and quartz were found in part of dissolved holes,and hydrothermal breccia carbonate rocks,an important lithofacies indicator of hydrothermal activity,were found in drilling coring.(2)Compared with limestone without hydrothermal modification,pinhole dolomite and saddle-shaped dolomite show the characteristics of delta δ¹⁸O negative migration,⁸⁷Sr/⁸⁶Sr positive migration,high Mn and low Sr.(3)Multi-stage magma-tectonism took place in Late Permian to Late Triassic in the study area,and a large number of deep hydrothermal fluids entered the sedimentary strata through deep and large faults,resulting in significant dissolution of surrounding rocks,forming a good reservoir space. The research results are of great significance for the deep exploration of high quality dolomite reservoirs.

Key words: trace elements, strontium isotope, breccia carbonate rock, hydrothermal action, Qixia Formation, Middle Permian, northwestern Sichuan Basin

CLC Number:

TE122.1

YANG Yuran, ZHANG Ya, XIE Chen, CHEN Cong, ZHANG Xiaoli, CHEN Shuangling, GAO Zhaolong. Hydrothermal action of Middle Permian Qixia Formation in northwestern Sichuan Basin and its effect on reservoirs[J].Lithologic Reservoirs, 2019, 31(6): 44-53.

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Hydrothermal action of Middle Permian Qixia Formation in northwestern Sichuan Basin and its effect on reservoirs

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