摘要
鸡西盆地位于黑龙江省东部,1985年见天然气显示,盆地有效勘探面积约占盆地面积的二分之一,生油坳陷局部遭受破坏,地质条件复杂,勘探风险较大.盆内主要充填白垩系及第三系,其中下白垩统分为鸡西群和桦山群,主要含煤层系鸡西群是油气勘探的目的层.下白垩统东荣组含海湾泻湖相暗色泥岩,而城子河组与穆棱组发育沼泽相煤和高碳泥岩.下第三系永庆组深湖相暗色泥岩丰富.烃源岩类型及纵向分布层位差异受沉积充填序列控制.孔隙型储层物性较差,具有实际意义的是裂隙型储层.生储盖组合匹配,已发现的天然气源于下白垩统鸡西群煤系地层,含气层的盖层是厚层泥岩与凝灰岩.鸡西盆地含有较丰富的天然气资源,大部分为煤成气,是一个含气盆地,应以天然气勘探为主要目标.建议在梨树镇坳陷下白垩统找气,在平阳镇坳陷下第三系找油.
Jixi Basin,located in the east of Heilongjiang Province, has a natural gas show in 1985,but only about half of the basin is effective exploration area,where hydrocarbon kitchens are partially destroyed,geological conditions are complex and exploration risk is high.It is mainly filled with Cretaceous and Tertiary sediments,and Lower Cretaceous is divided into Jixi and Huashan Groups,with the main coal bearing series Jixi Group being also a target for petroleum exploration.Dongrong Formation(K 1d) contains dark mudstone of bay lagoon facies,and Chengzihe Formation (K 1c) and Muleng Formation (K 1m) are coal and carbargillite of marsh facies.In Yongqing Formation (E 2y), there is a well developed dark mudstone of deep lake facies.The types and vertical distribution of source rock are controlled by sedimentary sequences.Although porous reservoirs have lower porosity and permeability,fractured reservoirs are practically meaningful.There are also source reservoir seal assemblages,and the gas found may derive from Lower Cretaceous coal bearing strata (K 1c and K 1m),with thick mudstone and tuff beds serving as a seal.As a gas bearing basin dominated by coal generated gas,Jixi′s main discoveries will be gas accumulations.It is suggested to search for gas in Lower Cretaceous of Lishuzhen depression and for oil in Paleogene of Pingyangzhen depression.
出处
《中国海上油气（地质）》
2001年第2期120-126,共7页
China Offshore Oil and Gas(Geology)
