The New Understanding and Exploration Significance in Triassic Baikouquan Formation of Eastern Mahu Sag

doi:10.11885/j.issn.1674-5086.2018.10.21.01

Abstract

Abstract: The oil and gas in the lower part of the second member of the Triassic Baikouquan Formation in the eastern Mahu Sag, Junggar Basin keep showing activity, and the industrial oil flow has been obtained in many Wells. However, there has been a dispute over the horizon of the gray sand conglomerate and the oil and gas layer. In order to further expand the exploration results of the Baikouquan Formation, we utilize the core, logging and seismic data, through the Paleogeomorphic restoration, waveform classification, and seismic attributes, to reclassify Baikouquan Formation, and analyze the paleogeomorphology, sedimentary facies belt and sedimentary model of the first Member of Baikouquan Formation. The results show that the Baikouquan Formation in this area is divided into 4 sections, which are superimposed step by step from bottom to top, and distributed in retrogradation and overlay; controlled by paleogeomorphology, three major provenance systems developed in the first Member of Baikouquan Formation, the front subfacies of fan-delta developed widely in the platform area of two flanks of the trench and the center of the sag; The three sets of oil layers developed from the bottom to the top, the lateral distribution being stable, and the closer to the center of the lake basin, the earlier of the oil and gas reservoir is formed; The reservoir of the first member of Baikouquan Formation is overlapped with the second member of Baikouquan formation reservoir of the high position of DA13 well block, which is characteristics of large area oil content. On the basis of the above new understanding, we pointed out that the first member of Baikouquan Formation is an important oil-bearing series in the study area, which is an important exploration area to find reservoir with economic sacle in the Baikouquan Formation.

Key words: Junggar Basin, Mahu Sag, Baikouquan Formation, stratigraphic division, sedimentary model, exploration field

CLC Number:

TE122

QIAN Haitao, YOU Xincai, WEI Yun, BAI Yu, WU Jun. The New Understanding and Exploration Significance in Triassic Baikouquan Formation of Eastern Mahu Sag[J]. 西南石油大学学报(自然科学版), 2020, 42(2): 27-36.

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