大民屯凹陷元古宇储集层特征及控制因素

大民屯凹陷元古宇为主要的油气产层,主要分布于凹陷的西部和北部,呈北东走向、由西南向北东呈阶梯状分布的格局,目前已建成了静安堡北、平安堡、安福屯油田。综合研究认为,中上元古界长城系的大红峪组和高于庄组储集层主要为碳酸盐岩和石英岩类,并将两组地层分7个沉积旋回18个小层。总结了不同岩性、不同小层的储集层特征,认为储集空间主要有裂缝、孔隙和洞3类,并以高角度裂缝为主。白云岩多为裂缝型储层;石英砂岩以裂缝为主,晶孔、晶洞、晶缝为辅型储层。结合测井资料,对含油气储层进行了识别和综合评价。对影响储集性能的因素进行了分析,认为受岩性、断裂、古风化、岩溶等条件综合控制,储集空间复杂,非均质性较强。

Proterozoic Reservoirs Features of Damintun Depression and Controlling Factors

Proterozoic era of Damintun depression is the important oil and gas producing reservoir in Liaohe field,which mainly distributes in the west and north of the depression in step array in north trend ang east trend.Up to date,Jing'anbaobei oilfield,Ping'anbao oilfield,Anfutun oilfield have been established.Through geological study,Proterozoic is divided into two formations,i.e,Dahongyu Formation and Gaoyuzhang Formations which are further divided into 18 zones with 7 sedimentary cycles.The dominant reservoir ...