Prediction of high quality deep and ultra-deep dolostones reservoirs in Tarim Basin by well logs
Lai Jin1,2, Bao Meng2, Liu Shi-Chen2, Li Dong2, Wang Song2, Yang Ke-Fu3, Chen Xu3, Wang Gui-Wen1,2, Ding Xiu-Jian4
1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 3 Research Institute of Petroleum Exploration and Development,Tarim Oilfield Company,CNPC,Xinjiang Korla 841000,China; 4 Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Shandong Qingdao 266580,China
Abstract The Cambrian dolostone is one of the most important exploration targets of deep and ultra-deep strata in Tarim Basin. However,it has characteristics of ancient geological age,deep burial,and complex tectonic and diagenetic evolution. Therefore,it is of great significance to understand the genetic mechanism,and establish a matched well logs evaluation method for various kinds of dolostone. Based on the comprehensive observation of core,thin section,conventional and imaging logs,two types of dolostone i.e. ,“karst transformation type”and “sedimentary facies dominated”are recognized in the Tarim Basin. The karst transformation dolostone reservoir are controlled by karst facies belt and can be divided into four zones in the vertical direction,namely the surface karst zone,vertical vadose zone,horizontal hyporheic zone and deep slow flow zone. The reservoir quality of depositional facies controlled dolostone is evidently controlled by high energy depositional facies such as the grain bank. The recognition patterns of karst dissolution belt and sedimentary microfacies by conventional and imaging logs data and marked by core sample are established and applied in the comprehensive interpretation of dolostone reservoir in the single well and prediction of favorable development area. The high angle fractures and horizontal dissolution vugs in the vertical vadose zone,horizontal hyporheic zone are favorable for the formation of high quality karst transformation type dolostone with fracture-cave system. The high energy depositional facies(shoal and reef facies,and tidal flat)are favorable for the formation of primary pores and secondary pores in the sedimentary facies dominated dolostone,and therefore become the high quality reservoirs. The results will provide theoretical guidance and technical support for the prediction of the spatial distribution of favorable deep and ultra-deep dolostone reservoir.
Fund:National Natural Science Foundation of China(No.41872133),Natural Science Foundation of Beijing(No.8204069),the Opening Fund of Key Laboratory of Deep Oil & Gas(No.20CX02116A),Science Foundation of China University of Petroleum(Beijing)(No.2462021YXZZ003)
Corresponding Authors:
Wang Gui-Wen,born in 1966,Ph.D.,professor,doctoral supervisor,is mainly engaged in sedimentology,reservoir geology and well logging geology.E-mail: wanggw@cup.edu.cn.
About author: Lai Jin,born in 1988,Ph.D.,associate professor,doctoral supervisor,is mainly engaged in sedimentology,reservoir geology and well logging geology.E-mail: laijin@cup.edu.cn.
Cite this article:
Lai Jin,Bao Meng,Liu Shi-Chen et al. Prediction of high quality deep and ultra-deep dolostones reservoirs in Tarim Basin by well logs[J]. JOPC, 2021, 23(6): 1225-1242.
Lai Jin,Bao Meng,Liu Shi-Chen et al. Prediction of high quality deep and ultra-deep dolostones reservoirs in Tarim Basin by well logs[J]. JOPC, 2021, 23(6): 1225-1242.
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