Progress on coupling relationship between volcanic and hydrothermal-originated sediments and hydrocarbon generation in lacustrine source rocks
Jiao Xin1, Liu Yi-Qun1, Zhou Ding-Wu2, Li Hong1, Meng Zi-Yuan1, Zhao Min-Ru1, Yang Yi-Yao1
1 State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China; 2 College of Earth Science and Engineering,Shandong University of Science and Technology,Shandong Qingdao 266510,China
Abstract：Intracontinental lacustrine source rocks are hydrocarbon-rich fine-grained sedimentary rocks with complex mineral compositions, which are widely distributed in Chinese petroliferous basins. The rocks are important unconventional oil and gas reservoirs amid increasingly demand for unconventional hydrocarbon resources. However,they have been mis-understood as simple terrestrial sedimentary rocks for a long time because the great difficulties in petrological and mineralogical research caused by their fine-grained size. Recent studies found abundant sediments generated by volcanic eruption and hydrothermal exhalation in this type of source rocks; the sediments show a significant control on hydrocarbon generation and accumulation. Hence,the mechanisms and controlling factors of volcanic-hydrothermal sediments in hydrocarbon generation of this type of source rocks require in-depth studies. This paper summarizes and discusses recent research status on some new discoveries and viewpoints on the relationship between volcanic and hydrothermal-originated sediments and hydrocarbon formation. The connotation of the coupling relationship was preliminarily studied using detailed petrological and mineralogical as well as inorganic and organic geochemical data,on the basis of our new viewpoints on source rocks in the Permian Lucaogou Formation in Santanghu Basin. The volcanic and hydrothermal-originated sediments not only have played a significant role in deposition and diagenesis of the source rocks,but also show a co-influence on hydrocarbon generation and accumulation with conventional lacustrine sediments. We suggest that the mineral and lithological features of lacustrine source rocks should be re-studied. The result will expand the theory of hydrocarbon generation in terrestrial sediments and,practically,serve as a guide for unconventional hydrocarbon exploration of similar source rocks.
Jiao Xin,Liu Yi-Qun,Zhou Ding-Wu et al. Progress on coupling relationship between volcanic and hydrothermal-originated sediments and hydrocarbon generation in lacustrine source rocks[J]. JOPC, 2021, 23(4): 789-809.
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