湘中涟源凹陷杨家山地区下石炭统天然气成藏条件  

Gas accumulation conditions of Lower Carboniferous in Yangjiashan region of Lianyuan Sag

作　　者：郭建华[1] 旷理雄[1] 朱锐[1] 周小康[1] 罗小平[2] 祁开令[2] 

机构地区：[1]中南大学地学与环境工程学院,湖南长沙 410083 [2]中国石化中南分公司石油勘探开发研究院,湖南长沙 410007

出　　处：《中南大学学报（自然科学版）》2008年第1期178-184,共7页Journal of Central South University:Science and Technology

基　　金：高等学校博士学科点专项科研基金资助项目(20050533019)

摘　　要：杨家山地区是涟源凹陷最有利的含气区块之一。以成盆、成烃和成藏理论为指导,应用盆地分析、有效烃源岩评价及流体包裹体分析等技术和方法,综合研究分析了杨家山地区下石炭统刘家塘组和石磴子组碳酸盐岩天然气成藏条件,建立了天然气成藏模式。研究结果表明:区内主要烃源岩为刘家塘组和石磴子组,总体达到较好-好烃源岩级别,具有一定的资源潜力;本区刘家塘组和石磴子组储集层类型为孔隙型、裂缝型和孔隙-裂隙型,区域封盖和直接封盖能力较好,但印支期后多期次构造运动对本区气保存条件影响较大;区内至少发生了2次天然气注入成藏期,其中最重要的气注入成藏期为晚三叠世;存在构造和岩性两大类气藏类型和近源早期成藏、近源二次成藏和近源晚期成藏3种成藏模式。Yangjiashan region is an important oil and gas exploration play of Lianyuan Sag, The gas accumulating conditions in the Lower Carboniferous Liujiatang Formation and Shidengzi Formation carbonate rocks in Yangjiashan region were studied, and gas accumulation models were established using the techniques of basin analysis, effective source rock evaluation, and fluid inclusion with the guidance of the theories of basin formation, hydrocarbon generation, and oil and gas accumulation, The results show the gas in Yangjiashan region comes from Liujiatang Formation and Shidengzi Formation source rock, and the source rock has definite resources potential; the carbonate rock reservoirs are hole, fracture and fracture-hole type, the Yangjiashan region is one of the best reservoirs play in the Lianyuan Sag; the seal conditions of lower Carboniferous Ceshui Formation seal rocks are fair, but structural event after indo-chinese epoch has the most important influence ＇on gas preservation; there exist two oil/gas charges in the Lower Carboniferous Liujiatang Formation and Shidengzi Formation carbonate rocks in Yangjiashan region, and the most important charge periods are late Triassic; there are three types of gas accumulation model in Yangjiashan region, i,e,, near source-early hydrocarbon accumulation, near source-qnadric hydrocarbon accumulation and near source-later hydrocarbon accumulation.

关 键 词：流体包裹体 成藏条件 保存条件 成藏模式 涟源凹陷 

分 类 号：TE112[石油与天然气工程—油气勘探]