薄储层综合预测技术在新疆塔里木盆地WS凸起的应用

Appliacation of Comprehensive Prediction Technology for ThinReservoirs in WS Uplift of Tarim Basin in Xinjiang

塔里木盆地WS地区新近系储层单层厚度小,横向变化大,单砂体厚度在2~10 m,储层岩性复杂,厚度变化快,传统地震预测技术维度和方法单一,预测精度低。为落实WS地区吉迪克组储层分布及内部油组展布,根据储层的测井敏感参数结合研究区内井位分布,优选在稀疏脉冲反演控制本区吉迪克组一、二、三段砂层组横向全貌的基础上,在研究区西南部——赛克地区针对吉迪克组三段纵向较薄的单个砂组或单砂体,进一步应用相控地质统计学反演和自然伽马协模拟反演。在多资料、多反演方法结合下,准确分辨出吉迪克组Ⅲ油组最薄砂体厚度为2 m的砂体储层分布范围,并进行了油气检测。储层预测技术的综合应用对塔里木盆地WS地区薄储层的精细刻画及岩性圈闭的圈定奠定了坚实基础,该结果有效支撑了井位优选,实际钻井的油气显示证实了该技术的合理性。

Neogene reservoir in WS uplift area of Tarim Basin characterizes with the thin thickness of single layer and the large lateral variation.The thickness of single sand body ranks between 2~10 m,the complex reservoir lithology,and the rapidly changes in thickness,the traditional seismic prediction techniques have limited dimensions and methods,resulting in insufficient prediction accuracy.In order to implement the distribution of reservoirs and internal oil formations in Gidike formation in WS uplift area,based on the sensitive logging parameters of the reservoir and the distribution of well locations in the study area,this paper proposes sparse pulse inversion to figure out the horizontal overview of sand-Ⅰ,Ⅱ,Ⅲmember of Gidike formation and thinner longitudinal thickness of sand-Ⅲmember of Gidike formation in the southwest of the research area-Saike region,geostatistical inversion and natural gamma assisted simulation inversion for further prediction of single sand group or single sand body.By combining multiple data and inversion methods,the distribution characteristics of the Gidike formation III oil formation can be accurately distinguished and then oil and gas detection are conducted when the thickness of thinnest sand body is 2 m.The comprehensive application of reservoir prediction technologys has laid a solid foundation for meticulous characterization of thin reservoirs and the delineation of lithologic traps in WS uplift area of Tarim Basin,which effectively supports well location optimization.Good oil and gas shows in actual exploration well confirm that the inversion methods for reservoir prediction in WS uplift area of Tarim Basin are effective.