Shallow-water onlap sedimentary mode of black organic-rich shale in the Longmaxi Formation,Upper Yangtze area
CHEN Lei1,2, TAN Xiucheng1,2,3, ZHENG Jian4, CHEN Xin1,2, YANG Yang4, XIONG Min1,2, WANG Gaoxiang1,5, JI Yubing6
1 Natural Gas Geology Key Laboratory of Sichuan Province,Southwest Petroleum University,Chengdu 610500, China; 2 Research Branch of Southwest Petroleum University,Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500, China; 3 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China; 4 Sichuan Changning Gas Development Co.,Ltd.,Chengdu 610051,China; 5 Shale Gas Research Institute,PetroChina Southwest Oil and Gas Company,Chengdu 610056,China; 6 PetroChina Zhejiang Oilfield Company,Hangzhou 310023,China
Abstract Fine-grained sedimentation determines the material basis of shale and plays an important role in the formation of high-quality shale. Based on the comprehensive analysis of drilling cores,outcrops,thin sections and seismic data,the sedimentary mode of the black shale from the Longmaxi Formation in the Upper Yangtze area was studied. The results show that(1)siltstone interbedded with shale,bioturbation,cross bedding,wavy laminae,graded laminae,orientation of mud gravel and basal erosion occurred in the black organic-rich shale of the Longmaxi Formation,which reveals obvious shallow water sedimentary characteristics. (2)The reverse graded deposition sequence of shale-silty shale-siltstone under wave action is developed in the black shale,reflecting that wave action has an important influence on the formation of black shale in the Longmaxi Formation. (3)The storm has a certain impact on the formation of black shale in the Longmaxi Formation,which shows the normal graded deposition sequence of siltstone to black shale formed on the irregular erosion surface. (4)A comparison of the seismic profile and regional stratigraphic well profile shows that the black shale of the Longmaxi Formation presents obvious onlap to the margin of the paleo-uplift with the rise in sea level. These results reflect that the black shale of the Longmaxi Formation in the Upper Yangtze area formed in limited shallow water,which is vulnerable to waves and storms. The continuous onlap of shale occurred with the rise in sea level. The shallow-water onlap sedimentary mode of the organic-rich shale in the Longmaxi Formation has significant guidance for the exploration of organic-rich shale in the Upper Yangtze area.
Fund:Financially supported by the National Natural Science Foundation of China(No.41602147)and Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance(No.2020CX020000)
About author: CHEN Lei,born in 1985,is an associate professor at Southwest Petroleum University. He is mainly engaged in researches on unconventional petroleum geology and sequence stratigraphy. E-mail: cl211@126.com.
Cite this article:
CHEN Lei,TAN Xiucheng,ZHENG Jian et al. Shallow-water onlap sedimentary mode of black organic-rich shale in the Longmaxi Formation,Upper Yangtze area[J]. JOPC, 2023, 25(3): 614-627.
CHEN Lei,TAN Xiucheng,ZHENG Jian et al. Shallow-water onlap sedimentary mode of black organic-rich shale in the Longmaxi Formation,Upper Yangtze area[J]. JOPC, 2023, 25(3): 614-627.
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