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DOI: https://doi.org/10.11698/PED.20240145

Multistage overlap slope break controlled shoals and shoals controlled reservoirs in compressive settings and favorable exploration zones: A case study of Cambrian Xixiangchi Formation in south slope of Leshan-Longnüsi paleouplift, Sichuan Basin, SW China

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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
    2. Southwest Petroleum University, Division of Key Laboratory of Carbonate Reservoirs, CNPC, Sichuan Chengdu 610500, China;
    3. Sichuan Provincial Key Laboratory of Natural Gas, Southwest Petroleum University, Sichuan Chengdu 610500, China;
    4. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gasfield Company, Sichuan Chengdu 610041, China;
    5. Hangzhou Research Institute of Geology, PetroChina, Zhejiang Hangzhou 310023, China

Received date: 2024-03-07

  Revised date: 2024-10-09

  Online published: 2024-10-31

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Abstract

Based on 2D and 3D seismic data and well logging data, this paper studies the distribution of well-seismic stratigraphic filling and shoal controlled reservoirs of Upper Cambrian Xixiangchi Formation in the south slope of Leshan-Longnüsi paleouplift in the Sichuan Basin, to reveal the genetic relationship between stratigraphic filling, paleogeomorphology and large-scale grain shoal. (1) The Xixiangchi Formation in the study area is overlapped and filled gradually to the Leshan-Longnüsi paleouplift, but gets thin sharply due to truncation only near the denudation pinch-out line of the paleouplift. Therefore, 2 overlap slope break belts and 1 erosion slope break belt are identified, and the Xixiangchi Formation is divided into 4 members from bottom to top. (2) The filling pattern of the overlapping at the base and erosion at the top indicates that the thickness of Xixiangchi Formation can reflect the pre-depositional paleogeomorphology, and reveals that the study area has a monoclinal geomorphic feature of plunging to southeast and being controlled by multistage slope break belts. (3) The large-scale grain shoals and shoal controlled reservoirs are developed longitudinally in the third and fourth member of the Xixiangchi Formation, and laterally in the vicinity of the multistage overlap slope break belts. (4) Overlap slope break belts are closely related to northwest trending reverse faults. The northwest to southeast compressive stress formed by the convergence of the western margin of South China Plate with the Himalayas landmass of the Qiangtang-Tethyan realm in the middle and late Cambrian led to the rapid uplift of the northwest margin of the Yangtze Plate and the expansion to the southeast, forming a gradually plunging multistage slope break paleogeomorphology. Combined with oil and gas test results, it is predicted that the favorable exploration zone of the grain shoal controlled reservoirs can cover an area of 3340 km2.

Key words： favorable exploration zone; overlap slope break belt; grain shoal; Xixiangchi Formation; south slope; Sichuan Basin; Leshan-Longnüsi paleouplift

Cite this article

MA Tao, TAN Xiucheng, LUO Bing, HE Yuan, XU Qiang, HUANG Maoxuan, LI Qirui, LONG Hongyu, HU Anping . Multistage overlap slope break controlled shoals and shoals controlled reservoirs in compressive settings and favorable exploration zones: A case study of Cambrian Xixiangchi Formation in south slope of Leshan-Longnüsi paleouplift, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 0 : 20241201 -20241201 . DOI: 10.11698/PED.20240145

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