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塔里木盆地玛扎塔格构造带奥陶系风化壳基质孔渗差,以次生缝洞体储层为主,非均质性强,缝洞体的分布特征对海相碳酸盐岩储层评价具有重要影响。通过岩心观察并结合测井资料分析,认为该区发育多期岩溶与裂缝。岩溶作用影响深度达400m,单井岩溶孔洞层为3～5层,单层厚10～50m。渗流带岩溶孔洞较发育,潜流带岩溶孔洞欠发育,岩溶强度较小,层段内岩溶孔洞断续分布。洞穴规模较小,机械充填严重。通过构造研究与古地貌恢复建立了研究区岩溶发育模式,和田河气田位于岩溶缓坡—洼地区,岩溶洞穴较少且多充填砂泥;而南部大面积风化壳是3期岩溶作用的叠加区,位于汇流溶蚀的岩溶斜坡区,有利于储层的发育与保存,是缝洞型油气藏勘探的有利方向。
The pore infiltration of Ordovician weathering crust in the Mazatag tectonic belt of the Tarim Basin is dominated by reservoirs of secondary fracture caverns and is characterized by strong heterogeneity and distribution of fractured-cave bodies. Evaluation has a significant impact. Through the observation of cores and the analysis of well logging data, it is considered that there are many karsts and fractures in this area. Karst effect depth of 400m, single well karst hole layer is 3 to 5, single thickness 10 ~ 50m. Seepage with karst pores more developed, underdeveloped karst pores with less development, karst strength is small, intermittent distribution of karst pores within the interval. Small caves, mechanical filling serious. The karst development model has been established in the study area by tectonic research and palaeogeomorphology restoration. The Hetianhe gas field is located in the gentle karst depression-depression area, with fewer karst caves and more filling of sand and mud. The large-area weathering crust in the south is a superimposed area of 3 karstification, Located in the confluence erosion karst slope area, is conducive to the development and preservation of reservoirs, is a favorable direction for the exploration of fractured-hole reservoirs.