Sedimentary characteristics and development model of lacustrine fine-grained hybrid sedimentary rocks in the Jurassic Da'anzhai Member,northern Sichuan Basin
CUI Hang1,2, ZHU Shifa1,2, SHI Zhensheng3,4, SUN Shasha3,4, CHANG Yan3,4, SUO Yihu1,2
1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 3 PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China; 4 Unconventional Oil & Gas Key Lab,PetroChina,Hebei Langfang 065007,China
Abstract：Water eutrophication occurred during the depositional period of Jurassic Da'anzhai Member in Sichuan Basin,forming lacustrine hybrid sedimentary strata of fossiliferous carbonate and shale. It provides a “natural laboratory”for the study of depositional mechanism of mixed sedimentary strata. In this paper,the lithologic classification and sedimentary facies distribution of Da'anzhai Member in Yilong-Yingshan area located at the northern Sichuan Basin are studied based on core and well logging data,and the depositional process and controlling factors of the mixed sedimentary strata are also discussed. The results show that the lacustrine mixed sedimentary strata was composed of intermixing and alternation of bivalves,ostracods components and fine-grained siliceous debris(including clay minerals). The shell beach was widely distributed in the depositional stage of Da1 and Da3 sub-member,while Da2 sub-member was dominated by semi-deep and deep lacustrine subfacies,which forms a complete lacustrine transgressive-regressive sedimentary cycle. Additionally,shallow-water coquina can be transported and re-deposited in deep-water environment driven by gravity flow. The lacustrine mixed depositional process was mainly facies mixing model and punctuated mixing model. The mixing depositional process was controlled by lake level fluctuation,provenance,geological agent, etc. The fluctuation of lake level controls the distribution of different sedimentary microfacies. Gravity flow caused by triggering mechanisms such as earthquakes,storms and waves,prompted the mixing of sediments from different material source and microfacies(terrigenous detrital transportation,bio-chemical carbonate deposition,suspended deposition of fine particles,etc.),increasing the internal disorder degree and expanding the spatial distribution scope of hybrid sedimentary rocks. Finally,the depositional mechanism model of lacustrine hybrid sedimentary rocks in Da'anzhai Member of Yilong-Yingshan area was established,which can provide theoretical support for the exploration of continental shale oil and gas and can provide reference for the study of hybrid sedimentary rocks under similar geological setting.
CUI Hang,ZHU Shifa,SHI Zhensheng et al. Sedimentary characteristics and development model of lacustrine fine-grained hybrid sedimentary rocks in the Jurassic Da'anzhai Member,northern Sichuan Basin[J]. JOPC, 2022, 24(6): 1099-1113.
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