车西洼陷沙四上亚段异常高压形成机制及其对特低渗储层特性的影响  

Mechanism of generating abnormal overpressure and its influences on super-low permeability reservoirs for upper Es_4 member in Chexi depression

作　　者：赵振宇[1] 顾家裕[1] 郭彦如[1] 阿里木江[2] 吴中彬[3] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中石化胜利测井公司,山东东营257000 [3]胜利油田桩西采油厂,山东东营257237

出　　处：《中国石油大学学报（自然科学版）》2010年第5期12-17,24,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油科技创新基金项目(2010D-5006-0104);中国石油天然气股份有限公司岩性地层油气藏富集规律与勘探技术研究重大专项(2008B-0103)

摘　　要：通过对车西洼陷沙四上亚段碎屑岩储层沉积、构造、成岩、物性、试油试采等资料综合分析,深入探讨该区异常高压的成因机制及其对储层产生的各种影响。研究表明:异常高压发育主要与地层不均衡压实有关,其次矿物成岩作用有助于超压的保存与提高;异常高压有效抑制了地层温度的增加和成岩作用的进一步加深;异常高压有效减缓了地层压实作用的增强,致使储层深部次生孔隙保存相对较好,为油气勘探开发提供了有利条件;在射孔厚度一定的情况下,以泥质砂岩为主的特低渗储层并非地层压力越大油气产能越高,高产油层压力系数1.2～1.3,这与储层内单砂体有效厚度、物性参数、含油饱和度、压力敏感性等因素有关。By means of analyzing sedimentary microfacies,structure features,diagenesis,porosity and permeability and geochemical testing data,the mechanisms of generating abnormal overpressure and its influences on super-low permeability reservoir of upper Es4member in Chexi depression were discussed detailedly. The results show that the principal mechanism of generating abnormal overpressure is disequilibrium compaction,and the secondary is mineral diagenesis. The formation temperature increasing and diagenesis deepening with depth are inhibited by abnormal overpressure. In the abnormal overpressure section,secondary porosity is relatively well preserved,which is a favourable condition for oil and gas exploration and development. In argillaceous sandstone-based super-low permeability reservoir,it is not a linear relationship between oil and gas production capacity and formation pressure coefficient,as a higher capacity corresponds to the pressure coefficient of 1. 2 1. 3. This phenomenon results from single sand body thickness （ sand-mud ratio） ,physical parameters,oil saturation and pressure sensitivity and so on.

关 键 词：车西洼陷 异常高压 特低渗储层 储层物性 地质参数 

分 类 号：TE122.2[石油与天然气工程—油气勘探]