川西坳陷须二气藏气田水成因、运移及其成藏演化

doi:10.11743/ogg20180210

摘要/Abstract

摘要： 西南油气分公司在川西建产的新场和大邑须二气藏投产后，气水关系复杂。为此，引用洛瓦克（Novk）相图分析法及气田水氘、氧同位素特征判别气田水产层及其成因类型，分析了气田水的动态运移，研究了川西须二气藏的成藏演化。结果表明：新场须二气藏气田水为须下盆雷口坡组的海相成因地层水，其形成时封闭较好，但因后期受构造运动影响使保存条件变差，下盆雷口坡组海相成因地层水运移至须二气藏，造成现今的气田水为海相成因地层水；大邑须二气藏气田水由须家河组原始沉积水逐渐变为须下盆雷口坡组的海相成因地层水，其形成时封闭性好，还原彻底，属于典型的古沉积水，但因提产致使须下盆雷口坡组的海相成因地层水沿控制大邑构造的断层运移至须二段，须家河组原始沉积水逐渐被须下盆雷口坡组的海相成因地层水替代，与大邑须二气藏现今气田水动态特征相吻合。成藏演化表明：新场、大邑须二气藏经历的成藏阶段不同，受裂缝系统影响不同，形成了不同类型的气藏。新场、大邑须二气藏气田水类型及动态特征不同是成藏演化的结果。

关键词: 成藏演化, 动态运移, 气田水, 须二气藏, 川西坳陷

Abstract: The gas reservoirs of Xu 2 developed by SINOPEC Southwest Company in Xinchang and Dayi were put into production,with the quite complicated distribution of gas/water.Therefore,adopting American hydrogeologists Novk's Phase diagram analysis and characteristics of deuterium and oxygen isotopes in gas field water,we identified the production formation of gas field water and its origin,analyzed the dynamic migration of gas field water,and investigated the evolution of gas accumulation in the western Sichuan Depression.The results show that (1) the gas field water of Xu 2 gas reservoir in Xinchang is originally marine formation water in the lower strata of the Xuxiahe Formation and Leikoupo Formation,which was in closed conditions initially but migrated into Xu 2 gas reservoir due to the change of preservation conditions caused by structural movement of later period,resulting in the present gas field water;(2) the gas field water of Xu 2 gas reservoir in Dayi changes gradually from the original deposition water in Xujiahe Formation to the marine formation water in the strata lower of the Xujiahe Formation and Leikoupo Formation.The water was well sealed and under thorough reduction conditions,which is typical of paleo-sedimentary water.But due to the increasing production of Xu 2 gas reservoir there,the marine formation water of Leikoupo Fomation in the lower strata has migrated into the 2^nd member of the Xujiahe Formation along faults controlling Dayi structure,replacing the paleo-sedimentary water of Xujiahe Formation.This scenario explains the present dynamic characteristics of gas field water in Xu 2 gas reservoir of Dayi.The accumulating evolution shows that Xu 2 gas accumulating process and the influence from fractures in Xinchang are different from those in Dayi,thereby generating different types of gas accumulations.Accordingly,the types and dynamic characteristics of gas field water in Xu 2 gas reservoir in Xinchang are different from those in Dayi.

Key words: accumulation evolution, dynamic migration, gas field water, Xu 2 gas reservoir, western Sichuan Depression

中图分类号:

TE122.1

康保平,黄小燕,郭淑萍,等. 川西坳陷须二气藏气田水成因、运移及其成藏演化[J]. 石油与天然气地质, 2018, 39(2): 309-317. doi: 10.11743/ogg20180210 Kang Baoping,Huang Xiaoyan,Guo Shuping,et al. Origin,migration,and accumulation evolution of reservoir water in the gas field with Xu 2 gas reservoir,western Sichuan Depression,Sichuan Basin[J]. Oil & Gas Geology, 2018, 39(2): 309-317. doi: 10.11743/ogg20180210

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