海安凹陷曲塘、海北次凹戴南组—三垛组一段沉积特征及演化

doi:10.11743/ogg20120213

Abstract

Abstract:

Through fine core observation and description,eleven different lithofacies were recognized in the 1^st member of Dainan Formation and the 1^st member of Sanduo Formation.According to the characteristics of logging data and lithofacies associations, and in combination with the regional depositional environment,this paper documents that the 1^st member of Dainan Formation is of braided delta sedimentary system and the 1^st member of Sanduo Formation is of fluvial sedimentary system with braided-river in the lower part and meandering-river in the upper part.During the deposition of the 1^st member of Dainan Formation,braided-river delta front were well developed in the northern fault terrace zone and the south-eastern slope zone of Qutang Sub-sag and the south-western slope zone of Haibei Sub-sag,and sandbodies of underwater distributary channels constitute the framework of the braided-river delta fronts at this time.During the deposition of the lower part of the 1^st member of Sanduo Formation,the study area was dominated by the braided-river channel and flood plain deposits,and channel bars were well developed.During the deposition of the upper part of the 1^st member of Sanduo Formation,the sedimentary subfacies changed to meandering river channel,bank and floodplain,with point bar deposits developed in the convex bank of channel.The sandbodies of underwater distributary channels,channel bar in braided river and point bar in meadering river have relatively good poroperm characteristics,and thus are favorable facies for hydrocarbon accumulation.

Key words: braided-river, meandering-river, braided delta, sedimentary characteristics, Dainan Formation, Sanduo Formation, Hai’an Sag

CLC Number:

TE112.1

Wei Xiangfeng, Zhang Tingshan, Liang Xing, Yao Qiuchang, Tang Xingyou. Sedimentary characteristics and evolution of the 1^st member of Dainan Formation and the 1^st member of Sanduo Formation in Qutang and Haibei Sub-sags,Hai’an Sag[J]. Oil & Gas Geology, 2012, 33(2): 265-276,301.

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Sedimentary characteristics and evolution of the 1^st member of Dainan Formation and the 1^st member of Sanduo Formation in Qutang and Haibei Sub-sags,Hai’an Sag

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Sedimentary characteristics and evolution of the 1st member of Dainan Formation and the 1st member of Sanduo Formation in Qutang and Haibei Sub-sags,Hai’an Sag

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Sedimentary characteristics and evolution of the 1^st member of Dainan Formation and the 1^st member of Sanduo Formation in Qutang and Haibei Sub-sags,Hai’an Sag