塔里木盆地沙雅隆起北部三道桥潜山结构与储层特征

Characteristics of Sandaoqiao Buried Hill Structure and Reservoir in the Northern Shaya Uplift of Tarim Basin,China

综合钻井、测井、地震及分析化验等资料,对塔里木盆地沙雅隆起北部新发现的三道桥潜山气藏的潜山结构和储层进行研究。结果表明:三道桥潜山为晚古生代末期—中生代早期由断层控制形成的断块潜山,发育多组断层和断片结构,长轴为NE—SW向,上覆中生界侏罗系—白垩系。三道桥潜山是由下部古元古界花岗岩结晶基底和上部的一套滨海—浅海相陆源碎屑岩-碳酸盐岩混合沉积地层、以及之上的新元古界阿克苏群共同组成,其中滨海—浅海相陆源碎屑岩-碳酸盐岩混合沉积地层经历过埋藏成岩改造;三道桥潜山气藏的储层岩性主要为粉晶白云岩、泥晶白云岩,储层基质物性较差,储集空间为裂缝和溶蚀孔洞;优质储层主要受后期断裂和岩溶作用控制。三道桥潜山气藏的发现进一步证实塔里木盆地沙雅隆起北部潜山构造裂缝和岩溶作用发育,具备形成优质储层和油气藏的条件,因此,该区带类似的潜山具有较大的油气勘探潜力。

Based on the drilling,logging,seismic and chemical analysis data,the characteristics of the new Sandaoqiao buried hill structure and reservoir in the northern Shaya uplift of Tarim Basin were discussed.The results show that Sandaoqiao buried hill is a fault block controlled by Late Paleozoic-Early Mesozoic faults;multi faults and fragment structures develop with the NE-SW long axis in Sandaoqiao buried hill,and the overlaying layer is Mesozoic Jurassic-Cretaceous;Sandaoqiao buried hill is made from the bottom crystalline basement of Paleoproterozoic granites,the middle mixed sediment strata of littoral-neritic facies terrigenous clastic-carbonate rocks,and the upper Neoproterozoic Akesu Group;the mixed sediment strata of littoral-neritic facies terrigenous clastic-carbonate rocks experience burial diagenetic transformation,and the thickness is 700-800m;the gas reservoir lithology of Sandaoqiao buried hill is crystal powder dolomite and putty crystal dolomite with the poor physical property of matrix,and the reservoir space isfracture and dissolution pore;the high quality reservoir is mainly controlled by the late fracture and karst process.It is further proved that the fracture and karst process of buried hill develop in the northern Shaya uplift of Tarim Basin,and have the advantage on forming high quality reservoir and hydrocarbon accumulation.Therefore,the zone like Sandaoqiao buried hill has great petroleum exploration potential.