Petroleum Exploration and Development >

2022 , Vol. 49 >Issue 2: 274 - 284

DOI: https://doi.org/10.11698/PED.2022.02.06

PETROLEUM EXPLORATION

Segmented evolution of Deyang-Anyue erosion rift trough in Sichuan Basin and its significance for oil and gas exploration, SW China

  • MA Kui ,
  • WEN Long ,
  • ZHANG Benjian ,
  • LI Yong ,
  • ZHONG Jiayi ,
  • WANG Yunlong ,
  • PENG Hanlin ,
  • ZHANG Xihua ,
  • YAN Wei ,
  • DING Yi ,
  • CHEN Xiao
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  • 1. Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    2. Chengdu University of Techonology, Chengdu 610059, China

Received date: 2021-05-20

  Online published: 2022-03-16

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Abstract

Based on analysis of field survey, drilling and seismic data, the formation and evolution process of Deyang-Anyue erosion rift trough in Sichuan Basin was reconstructed, and exploration areas were divided and evaluated. The results show that: (1) Dengying Formation in and around Deyang-Anyue erosion rift trough varies widely in sedimentary characteristics. The Dengying Formation in the northern part of the erosion rift trough developed deep-water sediments, the Dengying Formation in the northern part of the basin varied gradually from basin to slope, platform margin, and limited platform facies, and the Dengying Formation in the middle and southern parts of the trough developed carbonate platform facies. (2) Deyang-Anyue erosion rift trough is formed by extensional rift and karst erosion jointly, the north section of the erosion rift trough is mainly the product of tensile rift, while the middle and south sections are formed by erosion in multi-episodes of Tongwan period. (3) Based on the segmented origins of the erosion rift trough, Dengying Formation in and around it is divided into three exploration fields: lithologic mound and beach bodies at the northern platform margin of the basin, karst mound and beach bodies in the central platform, and karst residual mounds in the central southern trough of the basin, among them, the karst residual mounds in the central southern trough of the basin are a new frontier for natural gas exploration in the basin, and the lithologic mound and beach bodies at the northern platform margin are a new position for increasing the reserves of trillions of cubic meters of natural gas resources in the basin.

Key words： Sichuan Basin; Sinian Dengying Formation; deep water deposits; erosion rift trough; segmented origin; karst mounds; platform marginal lithologic mounds and shoals

Cite this article

MA Kui , WEN Long , ZHANG Benjian , LI Yong , ZHONG Jiayi , WANG Yunlong , PENG Hanlin , ZHANG Xihua , YAN Wei , DING Yi , CHEN Xiao . Segmented evolution of Deyang-Anyue erosion rift trough in Sichuan Basin and its significance for oil and gas exploration, SW China[J]. Petroleum Exploration and Development, 2022 , 49(2) : 274 -284 . DOI: 10.11698/PED.2022.02.06

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