基于模糊数学的湘中凹陷圈闭评价  

Trap Evaluation for the Central Hunan Depression based on Fuzzy Mathematics

作　　者：朱伟[1] 米茂生 曹子剑[1] 

机构地区：[1]湖南科技大学,湖南湘潭411201 [2]湖南省地质矿产勘查开发局,湖南长沙410014

出　　处：《特种油气藏》2014年第6期1-5,141,共5页Special Oil & Gas Reservoirs

基　　金：国家自然科学主任基金"湘中拗陷天然气成藏模式与深盆气探索"(41240019)

摘　　要：湘中拗陷是晚古生代南华陆表海盆在湘中的一个负向构造单元,先天成油气地质条件优厚,其中石炭系刘家塘组、石磴子组已发现大量油气显示及工业气流。目前发生气喷井18口,但岩心检测储层物性整体表现为低孔、低渗,岩性主要为台盆、三角洲、潮坪相的细粒石英砂岩、岩屑砂岩和泥晶灰岩。储层类型主要是孔隙型、裂缝型和孔隙-裂缝型,且非均质性较强,成藏条件较为复杂。采用基于模糊数学的评价方法,根据该区生油岩、储集层、盖层及圈闭的权重及其隶属度,建立了模糊数学关系模型。通过数学计算,选取了涟源凹陷的娄底背斜、安坪背斜为本区优势圈闭。同时为进一步勘探湘中凹陷有利成藏区块提供依据。The Central Hunan Depression is a negative element of Late Paleozoic South China land- surface sea basin in the middle of Hunan Province. The original geology is favorable for hydrocarbon generation,where abundant oil and gas shows and industrial gas flow have been discovered in the Carboniferous Liujiatang Fm and Shidengzi Fm. There are 18 gas blowout wells in this area,and core measurements indicate that the reservoir is featured by low- porosity and low- permeability. The dominant lithologies are fine- grained quartz sandstone,lithic sandstone and micrite of platform- basin,delta and tidal- flat facies. Reservoirs can be classified into pore- reservoir,fracture- reservoir and pore- fracture reservoir with strong heterogeneity and complex hydrocarbon accumulation conditions. According to the weights and corresponding membership degrees of source rock,reservoir rock,cap rock and trap,the fuzzy mathematics evaluation method is used to establish fuzzy mathematic model. Loudi anticline and Anping anticline in Lianyuan Sag are taken as favorable traps in this area through mathematical computation. Meanwhile,the research will provide a reference for further exploration of favorable plays in the Central Hunan Depression.

关 键 词：涟源凹陷 模糊数学 圈闭评价 天然气藏 

分 类 号：TE122.1[石油与天然气工程—油气勘探]