基于测井解释的碎屑岩储层成岩作用定量表征:以Q油田下干柴沟组下段为例  

Quantitative Characterization of Clastic Rock Reservoir Diagenesis Based on Log Interpretation:A Case Study from the Lower Segment of Ganchaigou Formation in Q Oilfield

作　　者：汪显栩 牟中海[1] 张国成 徐良威 Wang Xianxu;Mou Zhonghai;Zhang Guocheng;Xu Liangwei(School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;Qinghai Oilfield Company, PetroChina, Dunhuang Qinhai 736202, China)

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]中国石油青海油田分公司,青海敦煌736202

出　　处：《地质科技情报》2018年第1期240-246,共7页Geological Science and Technology Information

基　　金：中国石油天然气股份有限公司重大科技专项"柴达木盆地老区稳产提高采收率技术研究"(2011E-0306)

摘　　要：针对Q油田下干柴沟组下段的储层物性和含油性在横向上差异较大的特点,采用钻井取心、岩石薄片等资料对工区储层成岩作用类型及特征进行了定性分析,研究认为工区目的层储层物性横向变化主要由胶结作用和溶解作用共同控制。在此基础上,根据胶结作用、溶解作用的测井响应特征,选取经归一化处理后的GR、SP测井曲线,建立了成岩作用强度定量表征模型,并将各种成岩作用对储层物性综合效应定义为成岩系数。依据成岩系数的大小,将研究区目的层段储层划分为强胶结弱溶解相、中等胶结弱溶解相、中等溶解弱胶结相和强溶解弱胶结相4种类型,定量识别了研究区优质储层,确定了目的层优质储层的平面分布。最后,分析了储层产能和成岩系数之间的关系,验证了该定量表征模型的有效性和实用性。Reservoir diagenesis types and characteristics are analyzed qualitatively based on the information about drilling cores and petrographic thin sections,in allusion to the characteristics of wide difference of physical property and quality on the lower segment of Ganchaigou Formation lateral reservoir in Q Oilfield.It is concluded that the compaction causes the loss of primary pores,and the cementation of clay minerals,leading to the poor reservoir properties.They are the predominant reasons for the destruction of reservoir quality.On the contrary,dissolution is the most important factor for improving the reservoir quality in the study area.Generally,the change of physical property on lateral reservoir is controlled by cementation and dissolution collectively.Based on the log response characteristics of cementation and dissolution,GR and SP logs which have been normalized are chosen to establish the quantitative characterization model of diagenesis.Meanwhile,the combined effect on reservoir property from various diagenesis is defined as diagenesis coefficient.The reservoir of the lower segment of Ganchaigou Formation can be divided into four types of diagentic facies：intensively cemented and slight corroded facies,middle cemented and slight corroded facies,middle corroded and slight cemented facies,intensively corroded and slight cemented facies.According to the diagenesis coefficient the planar distribution of high-quality reservoir in objective interval is determined.Finally,the analysis of correlational relationship between reservoir capacity and diagenetic coefficient confirms the validity and practicality of the quantitative characterization model.

关 键 词：成岩作用 定量表征 岩石薄片 测井响应 成岩系数 

分 类 号：P618.130[天文地球—矿床学]