Discovery of Carboniferous Platform Margin Slope and Evolution of Regional Sedimentary Facies in Front Belt of Western Kunlun Mountains

doi:10.11885/j.issn.1674-5086.2021.09.26.03

Abstract

Abstract: The Carboniferous formation in front belt of western Kunlun mountains has good potential for hydrocarbon exploration, but no breakthrough has been made so far. The lack of in-depth research on the distribution characteristics and patterns of sedimentary phases is one of the main reasons for this. By systematically analyzing the Carboniferous sedimentary characteristics of 12 field profiles, 3 drillings, and one 2D seismic profile in the front belt of the western Kunlun mountains, we have identified for the first time about the platform margin slope in the Carboniferous, and have defined the type and characteristics of the regional sedimentary phases, as well as the distribution and evolution of the sedimentary phases, based on the idea of “defining the margin along the slope face”. The Carboniferous platform margin slope phase includes slip deposits, debris flow deposits, turbidity flow deposits, and hydrostatic deposits, which spread in an east-west direction along the front belt of western Kunlun mountains of southwestern Tarim Basin. In the Late Early Carboniferous, Heshilafu Formation-Early Late Carboniferous and Kalawuyi Period, the east of the Xin-Tibet Highway was Tiekelike ancient uplift, and the west of the Xinjiang-Tibet Highway located a platform margin face, which stripped from west to east in front belt of western Kunlun mountains, a lagoonal face developed on its inner side, and covered the main area of the Kashgar-Yecheng Sag. In the Azigan-Tahaqi period of Late Carboniferous, marine expanded and ancient uplift disappeared, and platform margin slope-platform margin-restricted platform-evaporative carbonate platform facies developed. Therefore, the Kashgar-Yecheng Sag is the main development area of the high-energy phase face, and has a good combination of source, reservoir and cap; it is the main target area for exploration of the front belt of western Kunlun mountain carboniferous system in southwestern Tarim Basin.

Key words: platform margin slope, characteristics of sedimentary facies, evolution of sedimentary facies, southwest Tarim Depression, front belt of western Kunlun mountains

CLC Number:

TE121

WANG Zhenyu, YANG Guang, CHEN Cai, WANG Bin. Discovery of Carboniferous Platform Margin Slope and Evolution of Regional Sedimentary Facies in Front Belt of Western Kunlun Mountains[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(5): 14-26.

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