四川盆地蓬莱气田茅口组储层孔隙结构特征及分类评价  

Pore structure characteristics and classification evaluation of Maokou Formation reservoir in Penglai Gas Field,Sichuan Basin

作　　者：徐诗雨 祝怡 曾乙洋 肖雪薇 林怡 赵春妮 何开来 黎洋 李怡雯 XU Shiyu;ZHU Yi;ZENG Yiyang;XIAO Xuewei;LIN Yi;ZHAO Chunni;HE Kailai;LI Yang;LI Yiwen(Research Institute of Exploration and Development,PetroChina Southwest Oil&Gas Field Company,Chengdu 610041,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041

出　　处：《天然气地球科学》2024年第12期2132-2141,共10页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“岩性地层油气重点领域综合地质研究与高效勘探关键技术攻关”(编号:2022KT0401)资助。

摘　　要：四川盆地蓬莱气田茅口组气藏近期获重大勘探突破,但区内储层非均质性较强、单井产能差异较大,尚缺乏系统的储层分类评价标准,制约了气藏的评价及后续勘探开发。基于钻井、测井、岩心及分析化验等资料,综合分析该区茅口组储层岩性特征、储集空间类型、物性特征和微观孔隙结构特征,建立了一套适用性较强的储层分类标准,并根据该标准对研究区储层类型进行评价。结果表明:蓬莱气田茅口组储层岩性复杂,储集空间类型及几何形态多样,孔隙度为0.15%~13.65%,渗透率为(0.001~83.5)×10~(-3)μm~2,物性分布范围较广,总体表现为低孔、特低渗的特征;划分出6种岩石孔隙结构类型,储层微观孔隙结构总体表现为中—细喉、中—低分选,非均质性较强,少数大孔隙对储层渗透性具有重要影响;建立了一套蓬莱气田茅口组储层分类评价标准,Ⅰ类储层产气能力最强,Ⅱ、Ⅲ类次之,Ⅳ类为非储层,研究区主要发育Ⅱ、Ⅲ类储层,该分类评价标准可为蓬莱气田茅口组后期勘探开发提供参考依据。The Maokou Formation gas reservoir in the Penglai Gas Field of the Sichuan Basin has recently achieved significant exploration breakthroughs.However,the reservoir heterogeneity in the area is strong,and there are significant differences in single well productivity.There is still a lack of systematic reservoir classifica⁃tion evaluation standards,which restricts the evaluation and subsequent exploration and development of the gas reservoir.Based on drilling,logging,core analysis,laboratory analysis and other data,a comprehensive analy⁃sis is conducted on the lithological characteristics,reservoir space types,physical properties,and micro pore structure characteristics of the Maokou Formation reservoir in this area.A set of reservoir classification stan⁃dards with strong applicability is established,and the reservoir types in the study area are evaluated according to this standard.The results show that the Maokou Formation reservoir in Penglai Gas Field has complex litholo⁃gy,diverse types and geometric shapes of reservoir spaces.The porosity ranges from 0.15%to 13.65%,the permeability ranges from(0.001-83.5)×10^(-3)μm^(2),and the physical property distribution range is wide.Over⁃all,it exhibits characteristics of low porosity and ultra-low permeability;divided into six types of rock pore structures,the overall micro pore structure of the reservoir is characterized by medium to fine throat and medi⁃um to low sorting,and strong heterogeneity.A few large pores have an important impact on the permeability of the reservoir;a set of classification and evaluation standards for the Maokou Formation reservoirs in Penglai Gas Field was established.Class I reservoir has the strongest gas production capacity,followed by Class II and III reservoirs,and Class IV is non-reservoir.The study area mainly develops Class II and III reservoirs.This classification and evaluation standard can provide reference for the later exploration and development of the Ma⁃okou Formation in Penglai Gas Field.

关 键 词：蓬莱气田 茅口组 储层 孔隙结构 分类评价 

分 类 号：TE121.1[石油与天然气工程—油气勘探]