Recognition of tight sandstone reservoir characteristics and development potential of the 2nd member of Xujiahe gas reservoir in Zhongba Gas Field

ZHANG Benjian; WANG Xingzhi; ZHANG Chuyue; WANG Xuli; SANG Qin

doi:10.13809/j.cnki.cn32-1825/te.2019.06.002

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Recognition of tight sandstone reservoir characteristics and development potential of the 2nd member of Xujiahe gas reservoir in Zhongba Gas Field
Vol. 9, Issue 6, Pages: 10-15(2019)
Published：2019
DOI： 10.13809/j.cnki.cn32-1825/te.2019.06.002
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DOI：

ZHANG Benjian, WANG Xingzhi, ZHANG Chuyue, et al. Recognition of tight sandstone reservoir characteristics and development potential of the 2nd member of Xujiahe gas reservoir in Zhongba Gas Field[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(6): 10-15. DOI： 10.13809/j.cnki.cn32-1825/te.2019.06.002.

摘要

中坝气田致密砂岩气藏受构造、裂缝因素控制

属于裂缝—孔隙型气藏。在分析储层基本特征的基础上

重点探讨了裂缝的控制因素

旨在弄清裂缝分布对储层的影响

预测剩余气分布区域。储层岩性致密时

以浅灰—灰色细—中粒岩屑长石石英砂岩为主。岩心分析孔隙度、渗透率平均分别约为6.29 %、0.19×10

-3

μm

属于低孔—低—特低渗储层

裂缝和次生溶孔是储层发育的关键。基于此

采用构造曲率法以及岩石力学实验两种方法对裂缝展开了研究

结果表明：面上裂缝主要沿构造轴线发育

并靠近东南翼弧突及北鞍部的枢纽带

岩性与裂缝关系密切。结合气藏数值模拟结果

对气藏开发潜力进行了分析

为下一步开发调整方案提供了一定的依据。

Abstract

The tight-sandstone gas reservoir in Zhongba gas field is a fracture-pore type reservoir controlled by structures and fractures. On the basis of analyzing the basic characteristics of reservoirs

the factors controlling the fractures are discussed to figure out the effect of fractures distribution on the formations and predict the distribution of residual gas. The reservoir is mainly composed of light gray-gray fine-medium lithic feldspar quartz sandstone with its average porosity and permeability being 6.29 % and 0.19×10

-3

μm

respectively. It belongs to low porosity and permeability formations. And based on this

the fracture was studied by means of tectonic curva

ture method and rock mechanics experiment. The results showed that the fractures on the surface were mainly developed along the structural axis and close to the southeast arc and the northern conjunction of the saddle. The developments of fractures were tightly related with lithology. Combined with the numerical simulation results of gas reservoir

the potentials of the gas reservoir are analyzed to support the scheme adjustment in the next stage of development.

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