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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (3): 369-380.doi: 10.11764/j.issn.1672-1926.2021.10.009

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Characteristics and hydrocarbon generation potential of Middle Permian marine source-rocks in central Sichuan Basin

Wei WANG1(),Limei REN2,Jiaju LIANG1(),Song TANG2,Haifeng YUAN1,Yuhan LI2   

  1. 1.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation，Chengdu University of Technology，Chengdu 610059，China
    2.Central Sichuan Division，PetroChina Southwest Oil & Gasfield Company，Suining 629000，China
  • Received:2021-08-20 Revised:2021-10-12 Online:2022-03-10 Published:2022-03-22
  • Contact: Jiaju LIANG E-mail:wangwei520106@163.com;liangjiaju15@cdut.edu.cn
  • Supported by:
    Formation items：The Project of PetroChina Southwest Oil & Gasfield Company(20200301-12);the Project of Science and Technology Department of Sichuan Province, China(2020YJ0426)

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Abstract:

In recent years， the Middle Permian in central Sichuan Basin has become a popular reservoir for natural gas exploration， with the high-yield industrial gas flow obtained from the exploration of Wells JT1， NC1， TT1， GS18 and MX42 in the Maokou and Qixia formations of the Middle Permian. The research shows that the hydrocarbon supply strata of Middle Permian natural gas in central Sichuan Basin are mainly the source rocks of Lower Paleozoic and Middle Permian， and the natural gas is mostly mixed source gas. At present， the research degree of Lower Paleozoic marine source rocks in Sichuan Basin is relatively high， but the research degree of Middle Permian marine source rocks is relatively low. Therefore， it is urgent problem to determine the distribution and hydrocarbon generation potential of middle Permian Marine source rocks. In order to describe the characteristics and hydrocarbon generation potential of the Middle Permian marine carbonate source rocks in central Sichuan Basin， this paper describes in detail the geochemical characteristics， logging response characteristics and distribution characteristics of the source rocks， and systematically evaluates the hydrocarbon generation intensity of the Middle Permian marine source rocks in central Sichuan Basin. The results show that： （1）The marine source rocks of the Middle Permian in central Sichuan are mainly poor to medium quality source rocks， and the quality of the source rocks of Maokou Formation is better than that of Qixia Formation； the organic matter types of source rocks are mainly type Ⅱ1， followed by type Ⅱ2， which are in the over-mature stage； （2）The middle Permian in the central Sichuan basin was a reductive sedimentary environment with certain salinity；（3）The logging response characteristics of organic carbon （TOC） in source rocks are clear， and the organic carbon （TOC） has the best correlation with natural gamma （GR） and acoustic time difference （AC）， so the TOC content of organic carbon can be predicted for the Middle Permian in central Sichuan Basin； （4）Vertically， the source rocks are mainly developed in the middle and lower parts of Qixia Formation （P2q1） and the middle and lower parts of Maokou Formation （P2m1-P2m2c）； Horizontally， it shows the characteristics of gradual thickening from north to east； （5）The hydrocarbon generation intensity of Maokou Formation in central Sichuan Basin is better than that of Qixia Formation， mainly ranging of （1.0-4.0）×109 m3/km2， increasing gradually from southwest to northeast， and the total hydrocarbon generation of Maokou Formation is 57.38×1012 m3.

Key words: Sichuan Basin, Central Sichuan Basin, Middle Permian, Marine source-rock, Hydrocarbon generation potential

CLC Number: 

  • TE122.1

Fig.1

Location（a） of the study area and comprehensive stratigraphic histogram（b）"

Fig.2

Distribution histogram of Qixia Formation and Mao-kou Formation of Middle Permian in central Sichuan Basin"

Fig.3

Carbon isotope distribution of kerogen in source rocks of Qixia Formation and Maokou Formation of Middle Permian in central Sichuan Basin"

Fig.4

The intersection diagram of Pr/nC17 and Ph/nC18（northwest Sichuan data quoted from GAO et al.［35］，2020）"

Fig.5

Spectrum of biomarkers of Middle Permian source rocks in central Sichuan Basin"

Fig.6

Intersection of measured TOC and logging curves of Middle Permian source rocks in central Sichuan Basin"

Fig.7

TOC well connection profile of Middle Permian source rocks in central Sichuan Basin"

Fig.8

Thickness distribution plan of source rocks of Qixia Formation in central Sichuan Basin"

Fig.9

Thickness distribution plan of source rocks of Maokou Formation in central Sichuan Basin"

Fig.10

Plane distribution of hydrocarbon generation intensity of Maokou Formation source rocks in central Sichuan Basin"

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