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The control of astronomical cycles on lacustrine fine-grained event sedimentation——A case study of the Chunshang sub-member of the upper Es_(4) in the Dongying Sag

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Petroleum Science 2023年第3期20卷 1395-1410页

作者： Tian-Yu Xu Jun Peng Le-Dan Yu Hao-Dong Han Yi-Ming Yang Yao Zeng Yu-Bin Wang School of Geoscience and Technology Southwest Petroleum UniversityChengduSichuan610500China Natural Gas Geology Key Laboratory of Sichuan Province Sothwest Petroleum UniwrsityChengduSichuan610500China Chengdu Geological Survey Center China Geological SurveyChengduSichuan610081China

fine-grained lacustrine sedimentation controlled by astronomical cycles remains a research weakness in sedimentology studies,as most studies have concentrated on how astronomical cycles affect the normal lacustrine fine-grained sedimentation,but how they affect the lacustrine fine-grained event sedimen-tation has been rarely studied.Therefore,this work researched the characteristics of event sedimentation by systematically observing the cores from 30 cored wells in the Shahejie Formation of the Dongying Sag at a depth of over 1800 m,with more than 4000 thin sections being authenticated and over 1000 whole rocks being analyzed by X-ray diffraction(XRD).The research object was the Chunshang Sub-member of Upper Es_(4) in the Fanye 1 well,as it had the most comprehensive analysis data and underwent the most continuous coring.We divided astronomical cycles into different orders and made corresponding curves using the gamma-ray(GR)curve,spectral analysis,power spectrum estimation,and module extreme values,there were 6 long eccentricity periods,22 short eccentricity periods,65.5 obliquity cycles,and 110.5 precession cycles in this sub-member.On this basis,this study analyzed the control of astronomical cycles on the lacustrine fine-grained event sedimentation,and the research shows deposits were developed by slide-slump,turbidities,hyperpycnites,and tempestites in the Chunshang Sub-member of the Upper Es_(4),with higher long eccentricity,the monsoon climate contributes to the formation of storm currents,while with lower long eccentricity,the surface deposits are severely eroded by rivers and rainfalls,thus developing the slide-slump,turbidities,and hyperpycnites.The relationship between the lacustrine fine-grained event sedimentation and astronomical cycles was studied in this case study,which can promote research on fine-grained sedimentary rocks in genetic dynamics and boost the theoretical and disciplinary development in fine-grained sedimentology.

关键词： Astronomical cycle fine-grained event sedimentation Long eccentricity Chunshang sub-member of the upper Es_(4) Dongying Sag

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