Hierarchical Control Function of the Paleogeomorphology in Triassic Period to Sedimentary in Mahu Sag

doi:10.11885/j.issn.16745086.2015.10.16.02

Abstract

Abstract: Exploration practice confirmed that Fan delta deposit has the characteristics of facies control of reservoir and production in the Triassic Baikouquan Formation in Mahu Sag. For the technical problem that the conventional sedimentary facies division technology is difficult to achieve the division of sedimentary microfacies in order to satisfy the demand of exploration. With the paleogeomorphology restoration technology and drilling data, we studied the hierarchical control function of the paleogeomorphology to the Fan Delta sedimentary in Baikouquan Formation, and achieved meticulous depiction of the front facies of Fan Delta. Studies indicate that the Fan Delta sedimentary in Baikouquan Formation hierarchically controlled by the paleogeomorphology in Triassic Period. Mountain pass,grooves,convex controls the main channel of Fan Delta,thus controls the plain facies of Fan Delta and the Mudstone between Fan Delta. The Platform Area controls the front facies of Fan Delta. The mainstream line towards the direction of the larger gradient, thus controls the symmetry of Fan Delta. Multistage slope breaks control the location of the hi-lo shorelines. In the platform area, secondary paleogeomorphology, including secondary groove and slope break, controls the subprime mainstream line direction, thus controls distribution of Lobes body in the front facies of Fan Delta.

Key words: Mahu Sag, Baikouquan Formation, Fan delta, paleogeomorphology, hierarchical control

CLC Number:

TE122

REN Benbing, QU Jianhua, WANG Zesheng, QIAN Haitao, TANG Yong. Hierarchical Control Function of the Paleogeomorphology in Triassic Period to Sedimentary in Mahu Sag[J]. 西南石油大学学报(自然科学版), 2016, 38(5): 81-89.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2015.10.16.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2016/V38/I5/81

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