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在滨里海盆地东缘Д南石炭系碳酸盐岩KT-II含油层系Д层岩心和录井资料稀缺的情况下,针对该区油气发现多年但储量一直未有效动用,导致碳酸盐岩储层钻井结果见效差、单井初始产能差异大的生产矛盾。通过井筒资料精细对比分析,确定Д南难动用储量区Д层复杂储层的有利层段为Д1底部鲕粒白云质灰岩所在的白云岩化带,该储层主要为孔洞缝复合型和孔隙-裂缝型。结合古构造和沉积相特征,确定储层有利分布相带为开阔台地相浅滩亚相滩微相,原始沉积环境和白云岩化作用控制着储层的发育。在有利相带约束下,优选地震属性并进行叠前叠后储层反演,根据储层厚度、孔隙度、裂缝发育程度及含烃指示等因素综合评价,预测Д1层复杂碳酸盐岩储层发育区为近NE SW向带状分布,为该区提高储量动用程度和钻井见效提供地质参考依据。
In the case of scarcity of Д-¢ ó cores and logging data in the southern Carboniferous carbonate KT-II oil layer in the eastern margin of the Pre-Caspian Basin, the oil and gas discoveries in this area have not been fully utilized for many years, Poor performance of reservoir drilling results, single-well initial production capacity of large differences in production contradictions. Through the careful comparison of the wellbore data, it is confirmed that the favorable layer of the Д-к complex reservoir in the south difficult-to-use reserve area is the dolomitization zone where the oolitic dolomitic limestone at the bottom of Д1 is located. The reservoir is mainly composed of pore-seam complex and pores Crack type. Based on the characteristics of palaeotectonics and sedimentary facies, it is determined that the facies distribution facies in the reservoir is facies facies facies facies facies facies facies facies facies, sedimentary environment and dolomitization control the reservoir development. Under favorable facies belt constraints, the seismic attributes are optimized and the post-stackup reservoir inversion is carried out. Based on the comprehensive evaluation of reservoir thickness, porosity, degree of fracture development and hydrocarbon indication, it is predicted that the complex carbonate reservoir The stratiform development zone is nearly NE SW belt distribution, providing geological reference for improving the utilization of reserves and drilling effective in this area.