川西须家河组致密砂岩成藏主控因素  

MAIN CONTROL FACTORS OF FORMING THETIGHT SANDSTONE GAS RESERVOIRS IN XUJI AHE FORMATION IN WEST SICHUAN DEPRES SION

作　　者：唐立章[1] 张贵生[1] 张晓鹏[1] 安凤山[1] 

机构地区：[1]中国石化西南分公司勘探开发研究院

出　　处：《天然气工业》2004年第9期5-7,1,共3页Natural Gas Industry

摘　　要：通过对须家河组天然气成藏地质条件、构造形成演化、储层孔隙演化、生排烃史及其相互间的配置关系的综合分析研究 ,取得了对川西坳陷须家河组非常规致密砂岩气藏的成藏特征和成藏主控因素的初步认识 :①印支期、尤其是燕山期形成的古构造控制天然气的早期聚集和分布 ;②古构造—成岩圈闭是富集油气的主要圈闭类型 ;③天然有效裂缝系统是高产的关键 ;④古今复合圈闭是天然气勘探最有利的目标。这些认识和成果在指导勘探实践中取得了较好的效果。Through drilling it was proved that the Xujiahe Formation in West Sichuan Depression is of good ex ploration potential,the gas shows in drilling being commonly found in Xujiahe Formation. However, these questions,i, e. where was the natural gas enriched? what is the main control factor of reservoir formation? must be faced by exploration geologists. On the basis of analyzing comprehensively the geological conditions,structural evolution,reservoir pore evo lution, hydrocarbon-generation and-expelling histories and their interrelations, the characteristics and main control fac tors of forming the unconventional tight sandstone gas reser voirs are summarized as: ①the early gas accumulation and distribution were controlled by the paleo-uplift formed in In do-Chinese epoch, especially in Yanshan epoch; ②the paleo structural-diagenetic traps are mainly the traps of enriching oil and gas; ③the existence of effective natual fracture sys tems is the key to high productivity;and ④ the ancient-pres ent superposition traps are the beneficial targets of exploring for natural gas. A fairly good result has been obtained by use of these achievements and knowledge in guiding gas explora tion.

关 键 词：主控因素 成藏 须家河组 致密砂岩气藏 成岩 复合圈闭 圈闭类型 形成演化 印支期 川西 

分 类 号：P618.13[天文地球—矿床学]