Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 139-151.doi: 10.12108/yxyqc.20220512

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Source-reservoir characteristics and configuration of the third member of Middle Triassic Leikoupo Formation in central Sichuan Basin

RUAN Yunbo1,2, ZHOU Gang3, HUO Fei1,2, SUN Haofei3, GUO Pei1,2, LUO Tao1, JIANG Huachuan1,2, WEN Huaguo1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China
  • Received:2021-11-17 Revised:2022-03-10 Online:2022-09-01 Published:2022-09-06

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Abstract: Based on the data of core observation and thin section identification,combined with the analysis results of rock physical properties,X-ray diffraction,total organic carbon(TOC)content,rock pyrolysis and kerogen carbon isotope,the characteristics of source rocks and reservoirs of the third member of Middle Triassic Leikoupo Formation(T2 l3)in the Central Sichuan Basin and their configuration relationship were systematically studied. The results show that:(1)There is a set of hydrocarbon source rocks mainly composed of shale and marl developed in the second sub-member of T2l3(T2l32)in Central Sichuan Basin,with a thickness of 20-100 m. The average TOC value of shale is 1.08%,up to 4.01%,and the average TOC value of marl is 0.40%. The organic matters are mainly type Ⅱ1,followed by type Ⅰ,which are in the early stage of high maturity to over maturity,and have good hydrocarbon generation potential.(2)A set of reservoir mainly composed of silty dolomite and sandy dolomite is developed in the third sub-member of T2 l3(T2 l33). The reservoir space is mainly composed of intercrystalline(dissolved)pores and intergranular dissolved pores,with an average porosity of 4.05% and an average permeability of 1.1 mD. It has the characteristics of low porosity and medium permeability.(3)The source rocks of T2 l32 have a good source-reservoir configuration relationship with the reservoirs of T2 l33,which can form the hydrocarbon accumulation model of "lower generation and upper accumulation" and "self-generation and self-accumulation". The fracture system is not only an oil and gas migration channel,but also an important reservoir space. The overlying gypsum salt rocks of the fourth member of Leikoupo Formation and the mudstone of the first member of Xujiahe Formation are effective caprocks.

Key words: hydrocarbon source rocks, dolomite, source-reservoir configuration, lower generation and upper accumulation, self-generation and self-accumulation, the third member of Leikoupo Formation, Middle Triassic, central Sichuan Basin

CLC Number: 

  • TE122.1
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[2] LIU Zhen,CHEN Yanpeng,ZHAO Yang,HAO Qi,XU Xiaoming,CHANG Mai. Distribution and controlling factors of hydrocarbon reservoirs in continental fault basins[J]. Lithologic Reservoirs, 2007, 19(2): 121 -127 .
[3] DING Chao，GUO Lan，YAN Jifu. Forming conditions of Chang 6 reservoir in Anding area of Zichang Oilfield[J]. Lithologic Reservoirs, 2009, 21(1): 46 -50 .
[4] LI Yanshan，ZHANG Zhansong，ZHANG Chaomo，CHEN Peng. Application of mercury injection data to Chang 6 reservoir classification in Changqing area[J]. Lithologic Reservoirs, 2009, 21(2): 91 -93 .
[5] LUO Peng,LI Guorong,SHI Zejin,ZHOU Dazhi,TANG Hongwei,ZHANG Deming. Analysis of sequence stratigraphy and sedimentary facies of M aokou Formation in southeastern Sichuan[J]. Lithologic Reservoirs, 2010, 22(2): 74 -78 .
[6] ZUO Guoping， TU Xiaolong， XIA Jiufeng. Study on volcanic reservoir types in Subei exploration area[J]. Lithologic Reservoirs, 2012, 24(2): 37 -41 .
[7] WANG Feiyu. Method to improve producing degree of thermal recovery horizontal wells and its application[J]. Lithologic Reservoirs, 2010, 22(Z1): 100 -103 .
[8] YUAN Yunfeng，CAI Ye，FAN Zuochun，JIANG Yiyang，QIN Qirong， JIANG Qingping. Fracture characteristics of Carboniferous volcanic reservoirs in Hongche fault belt of Junggar Basin[J]. Lithologic Reservoirs, 2011, 23(1): 47 -51 .
[9] YUAN Jianying， FU Suotang， CAO Zhenglin， YAN Cunfeng，ZHANG Shuichang， MA Dade. Multi-source hydrocarbon generation and accumulation of plateau multiple petroleum system in Qaidam Basin[J]. Lithologic Reservoirs, 2011, 23(3): 7 -14 .
[10] SHI Zhanzhan， HE Zhenhua， WEN Xiaotao， TANG Xiangrong. Reservoir detection based on EMD and GHT[J]. Lithologic Reservoirs, 2011, 23(3): 102 -105 .
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