Investigation of the Typical Oil Reserves and Selection of Exploration Fields of the Dabasong Fan, Eastern Slope of the Mahu Depression

doi:10.11885/j.issn.1674-5086.2017.11.07.06

Abstract

Abstract: The eastern slope of the Mahu Depression in the Junggar Basin possesses excellent conditions for oil reserve formation and characteristics indicative of an oil reserve of large area. The region has been scarcely explored, so it is a key area for oil and gas exploration. To determine the oil reserve formation pattern along the eastern slope of the Mahu Depression and to allow in-depth oil and gas exploration in the region, data from boreholes, cores, seismology, and analytical tests were integrated and techniques such as palaeo-geomorphology reconstruction, sedimentary facies characterization, and reservoir prediction for gravel-containing medium to coarse sandstones were employed. The oil reserve characteristics, main controlling factors, and exploration fields of the Triassic Baikouquan Formation at the DA13 site in the north wing of the Dabasong Fan were examined. The results demonstrate that the oil reserve is a fault-lithologic reservoir and is mainly jointly controlled by faults and largescale wide and gentle platform zones, slope breaks, and favorable front facies belts. While oil accumulation and sand bodies are determined by tectonics and slope breaks, respectively, the reserve itself is controlled by both lithology and faults. Therefore, by comparing the reserve formation conditions, it is confirmed that the south and north wings of the Dabasong Fan have similar reserve formation backgrounds and conditions. By analyzing the single-well facies and the seismic facies, large-scale favorable front facies belts and multiple fault-lithological traps are noted under the south wing of the Dabasong Fan. The region has great potential for exploration and is the favorable site for expanding oil and gas exploration in the Baikouquan Formation along the eastern slope of the Mahu Depression.

Key words: eastern slope of the Mahu Depression, Dabason Fan, Baikouquan Formation, controlling factor, exploration field

CLC Number:

TE122

QIAN Haitao, BAI Yu, YOU Xincai, LI Peng, YIN Lu. Investigation of the Typical Oil Reserves and Selection of Exploration Fields of the Dabasong Fan, Eastern Slope of the Mahu Depression[J]. 西南石油大学学报(自然科学版), 2019, 41(1): 57-67.

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