低渗透储层应力敏感性控制因素研究  

Controlling Factors of Stress Sensitivity in Low-Permeability Reservoirs

作　　者：杜新龙[1] 康毅力[1] 游利军[1] 杨斌[2] 黎金明[2] 金祥哲[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]川庆钻探工程有限公司工程技术研究院,陕西西安710021

出　　处：《天然气地球科学》2010年第2期295-299,共5页Natural Gas Geoscience

基　　金：国家重大专项"低渗透油气田储层保护技术"(编号:2008ZX05022-04);四川省杰出青年学科带头人培养基金项目(编号:07ZQ026-113);中国石油天然气集团公司应用基础研究项目(编号:07A20402)联合资助

摘　　要：应力敏感是造成低渗透油气田储层损害的主要原因之一,科学客观地评价应力敏感对于保护低渗透储层有着重要的意义。以姬塬油田低渗透储层为例,开展了基块岩样和人工造缝岩样应力敏感性实验。结果表明,基块岩样为弱应力敏感性,裂缝岩样为强应力敏感性。在外力作用下,岩石的本体变形和结构变形是产生应力敏感的主要原因。岩石的结构变形主要受孔隙度、岩石颗粒的接触方式、岩石颗粒的胶结情况、粘土矿物产状以及裂缝发育程度等因素影响;岩石的本体变形主要受岩石组分影响。岩心柱塞尺度微裂缝出现频度较低、粘土矿物"绿泥石包壳"发育及其良好的保护孔隙作用是基块岩样表现为弱应力敏感性的重要控制因素。Since stress sensitivity is one of factors of reservoir damage in the low permeability petroleum field, it is important to evaluate stress sensitivity to reservoir damage. In this paper, we did the experiment of stress sensitivity for matrix and fractured cores sampled from the typical low-permeability reservoirs of Jiyuan oilfield. The stress sensitivity of matrix cores is weak, while it is intense for fractured cores. Under function of outside force, the structural deformation and primary deformation is a main factor for the stress sensitivity. The structural deformation of rock is controlled by porosity, particle contact style, particle cement, occurrence of clay mineral, fractures, etc. The primary deformation of rock is mainly influenced by its components. The important controlling factors of weak stress sensitive in matrix cores are low frequency of microfissure in core scale, greenite inclusion in clay mineral, well preserved pores.

关 键 词：低渗透 应力敏感 岩石组分 粘土矿物产状 裂缝 

分 类 号：TE135[石油与天然气工程—油气勘探]