川西地区龙门山前带侏罗系物源与沉积体系演化

doi:10.11743/ogg20190216

Abstract

Abstract: Proximal sedimentary system in foothill belt of foreland basin has become a hot and hard topic in sedimentology in recent years.During the Jurassic depositional period,a set of proximalcoarse-grained sedimentary systemwas developed in the foothill belt of Longmen Mountain in the western Sichuan Basin.We analyzed the provenance features and sedimentary system evolution in different periods using an integrated dataset of seismic,well logging,core and outcrop data.The results show that:(1) during the Jurassic,there were 5 provenances in the minor axis and near-major axis directions in the foothill belt of Longmen Mountain; (2) in the Early Jurassic,alluvial fan-meandering river delta-shore-shallow lake-semi-deep lake system dominated this area,while in the Middle and Late Jurassic,alluvial fan-braided river delta-shore-shallow lake system were developed well here; (3) three types of sedimentary models can be identified in the foothill belt of Longmen Mountain,namely the Early,Middle,and Late Jurassic sedimentary models.This study canprovide theoretical guidance and data support for the exploration of the tight sand gas reservoirs in the foothill belt of Longmen Mountain,and deepen our understanding of the proximal coarse-grained alluvial reservoirs.

Key words: coarse-grained deposit, provenance analysis, sedimentary evolution, foothill belt, western Sichuan Basin

CLC Number:

TE121.3

Deng Li, Liu Junlong, Qian Yugui, Zhang Shihua, Wang Tianyun, Yu Haiyue. Provenance and sedimentary system of the Jurassic successions in the front of Longmen Mountain in western Sichuan Basin[J]. Oil & Gas Geology, 2019, 40(2): 380-391.

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Provenance and sedimentary system of the Jurassic successions in the front of Longmen Mountain in western Sichuan Basin

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