Genetic pattern of lowresistivity gas reservoirs in the Xujiahe Formation, southeastern Sichuan Province

doi:10.11743/ogg20110115

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Genetic pattern of lowresistivity gas reservoirs in the Xujiahe Formation, southeastern Sichuan Province
Vol. 32, Issue 1, Pages: 124-132(2011)
Online First：28 February 2011，

Published：2011
DOI： 10.11743/ogg20110115
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DOI：

Genetic pattern of lowresistivity gas reservoirs in the Xujiahe Formation, southeastern Sichuan Province[J]. 2011, 32(1): 124-132. DOI： 10.11743/ogg20110115.

摘要

川东南地区上三叠统须家河组含气层普遍具有低阻特征，成因类型复杂多样，气、水关系复杂，识别难度大。利用岩心分析化验、录井、测井、构造及试油等资料，结合低阻气层测井响应特征，从宏观和微观方面入手，对该区低阻气层成因机制进行系统深入剖析。研究表明，造成该区低阻气层的主控因素为：①低幅度构造背景下发育低孔、低渗泥质砂岩储层；②孔隙结构复杂，高束缚水饱和度，高地层水矿化度；③低能沉积环境下储层颗粒细，泥质含量较高，粘土矿物附加导电性及局部导电矿物富集。储层物性与电阻率呈一定负相关关系。

Abstract

Gas reservoirs in the Upper Triassic Xujiahe Formation

southwestern Sichuan Province are characterized by low resistivity

complex genetic types and complex gaswater relationships

which make them hard to identify. Using data from core analysis

logging

structures

testing and logging responses

we thoroughly examine genetic pattern of low resistivity gas reservoirs in the study area from macro and microviews. According to this study

main controlling factors responsible for the development of these low resistivity gas reservoirs are: 1) muddy sandstone reservoirs with low porosity and permeability developing in the context of lowamplitude structures; 2) complex pore configurations

high water saturation

and high formation water salinity; 3) lowenergy sedimentary environment resulting in fine particles in reservoirs

high mud content

some clay minerals with conductivity and enrichment of conductive minerals in certain areas. Reservoir quality has a negative correlation with resistivity.