塔河油田奥陶系碳酸盐岩储层特征

岩芯测试结果表明:塔河油田碳酸盐岩储集空间主要为颗粒之间的孔、缝、洞;而基质基本不具储集能力。洞穴型、风化裂隙型及构造裂隙型储层在塔河地区普遍发育;地表残积带裂隙孔洞型储层主要分布于C₁与O₁的不整合面附近;台缘滩相颗粒灰岩溶蚀孔隙型储层分布在南部沙76井一带的下奥陶统。依据裂隙组系展布与成岩组构的关系分析,推测阿克库勒凸起轴部应为裂隙型储层的有利发育区。钻井勘探新成果显示,塔河油田南缘S6-9S76井一带是今后寻找台缘滩相颗粒灰岩溶蚀孔隙型储层的重要地区。

CHARACTERISTICS OF ORDOVICIAN CARBONATE ROCK RESERVOIRS IN TAHE OILFIELD

Rock cores testing indicate that space of carbonate rock reservoirs in Tahe oilfield are mainly interparticle pores, fissures and cavities; Their matrix almost do not have reserving capability. Reservoirs in cavity type, {weathering} fissure type and structural fissure type are commonly developed in Tahe region. Fissures in the {surface} {eluvial} belts-cavity reservoirs are largely spread near the unconformable contacts of C 1 and O 1. Reservoirs in {dissolution} porosity- type in particle limestone in the platform edge of bank facies are commonly spread along the area of the lower Ordovician in Southern Sha well No.76.It is conjectured by analyzing relations between extension of the {fissure} series and the diagenetic fabrics that the cam shaft part in Akekuler would be favorable well-developed area for reservoirs in cavity type. New results from well drilling indicate that the area along well S 69-S 76 in southern margin of Tahe oilfield will be a very important one for the exploration of reservoirs in {dissolution} porosity- type in particle {limestone} in the platform edge of bank facies