摘要
为了实现海相深层页岩气(埋深大于3500 m)储层强非均质性背景下的有利层段划分和甜点区域圈定,以川南LZ地区五峰组—龙马溪组海相深层页岩为研究对象,在分析页岩气甜点主控因素基础上,从地质−工程相结合的角度入手,提出8项甜点评价参数并优选出4项核心指标,构建多因素控制下的海相深层页岩气储层甜点分级分类评价指标体系,并基于核心指标精细求取结果,在平面上圈定了有利地质−工程甜点区域。研究结果表明:深层页岩气富集高产主要受控于岩性、厚度、孔隙度、总有机碳质量分数(w(TOC))、成熟度、含气量、压力系数以及脆性指数即8项甜点评价参数,其中w(TOC)、孔隙度、总含气量及脆性指数是甜点评价最核心的4个指标;研究区深层页岩气储层甜点类型可分为3大类,其中最优的I类甜点层段核心指标界限为:w(TOC)>3.0%、孔隙度超过5.0%、总含气量超过3.0 m^(3)/t以及脆性指数大于0.55;平面上,I类甜点主要分布在G202-h1,L203,L207和L208等井区,整体产量较高,为深层页岩气富集高产区域,且与当前生产实践吻合性较好。
For the division of the favorable layers and delineation of sweet areas in the marine deep shale gas(depth of greater than 3500 m)reservoirs with the characteristics of strong heterogeneity,marine deep shales of Wufeng—Longmaxi formation in LZ block of southern Sichuan basin were taken as an example.Then,on the basis of analyzing the main controlling factors of shale gas desserts,8 dessert evaluation parameters were proposed and 4 core indicators were selected from the perspective of combining geology and engineering factors,and the evaluation index system fot dessert classification was also established.Finally,favorable geological−engineering sweet spot areas were determined on the plane according to the multi-well core index parameters logging calculation.The results show that enrichment and high production of marine deep shale gas are mainly influenced by lithology,thickness,physical properties,total organic carbon mass fraction(w(TOC)),maturity,gas content,pressure coefficient and brittleness index,in which w(TOC),porosity,total gas content and brittleness index are the 4 core indicators.Sweet spot of deep shale gas reservoir can be divided into three categories and threshold of the 4 core indicators in optimum shale gas interval with high production are as follows:w(TOC)is more than 3.0%,porosity is over 5.0%,total gas contentis more than 3.0 m^(3)/t and brittleness index is greater than 0.55.The area with type I in the plane is mainly distributed in G202-h1,L203,L207 and L208 well areas,which is the high production shale gas area and the evaluation and division results are in good agreement with the production practices.
作者
张少龙
闫建平
石学文
钟光海
郑马嘉
黄毅
蔡进功
唐洪明
胡钦红
梁强
ZHANG Shaolong;YAN Jianping;SHI Xuewen;ZHONG Guanghai;ZHENG Majia;HUANG Yi;CAI Jingong;TANG Hongming;HU Qinhong;LIANG Qiang(State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Shale Gas Research Institute,PetroChina Southwest Oil and Gas Field Company,Chengdu 610051,China;PetroChina Southwest Oil and Gas Field Company,Chengdu 610051,China;Southwest Branch,CNPC Logging Company Limited,Chongqing 400021,China;Department of Earth and Environmental Sciences,University of Texas at Arlington,Arlington TX 76019,USA;Research Institute of Exploration and Development,PetroChina Changqing Oil Field Company,Xi'an 710018,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第9期3666-3680,共15页
Journal of Central South University:Science and Technology
基金
中国石油−西南石油大学创新联合体科技合作项目(2020CX020000)
国家自然科学基金资助项目(41830431)
四川省科技厅应用基础研究计划项目(2022NSFSC0287)
高等学校学科创新引智计划(111计划)项目(D18016)
南充市市校科技战略合作项目(SXHZ017)。
关键词
深层页岩气
地质−工程耦合
指标体系
测井评价
平面分布
deep shale gas
geological and engineering integration
index system
well logging evaluation
plane distribution
