Abstract

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Title:: Characteristics of Sandaoqiao Buried Hill Structure and Reservoir in the Northern Shaya Uplift of Tarim Basin, China

Author(s):: HAN Qiang; YANG Zi-chuan; LI Hong-yan; PU Ren-hai; YAN Liang; JIAO Cun-li; 1. Institute of Exploration and Development, Northwest Oilfield, SINOPEC, Urumqi 830011, Xinjiang, China； 2. Department of Geology, Northwest University, Xi’an 710069, Shaanxi, China; 3. SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China

Keywords:: buried hill; dolomite reservoir; block structure; karst process; fracture; Shaya uplift; Tarim Basin

Abstract:: Based on the drilling, logging, seismic and chemical analysis data, the characteristics of the new Sandaoqiao buried hill structure and reservoir in the northern Shaya uplift of Tarim Basin were discussed. The results show that Sandaoqiao buried hill is a fault block controlled by Late Paleozoic-Early Mesozoic faults; multi faults and fragment structures develop with the NE-SW long axis in Sandaoqiao buried hill, and the overlaying layer is Mesozoic Jurassic-Cretaceous; Sandaoqiao buried hill is made from the bottom crystalline basement of Paleoproterozoic granites, the middle mixed sediment strata of littoral-neritic facies terrigenous clastic-carbonate rocks, and the upper Neoproterozoic Akesu Group; the mixed sediment strata of littoral-neritic facies terrigenous clastic-carbonate rocks experience burial diagenetic transformation, and the thickness is 700-800 m; the gas reservoir lithology of Sandaoqiao buried hill is crystal powder dolomite and putty crystal dolomite with the poor physical property of matrix, and the reservoir space is fracture and dissolution pore; the high quality reservoir is mainly controlled by the late fracture and karst process. It is further proved that the fracture and karst process of buried hill develop in the northern Shaya uplift of Tarim Basin, and have the advantage on forming high quality reservoir and hydrocarbon accumulation. Therefore, the zone like Sandaoqiao buried hill has great petroleum exploration potential.