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

摘要/Abstract

摘要：

通过对取心井岩心的精细观察和描述,在戴南组一段和三垛组一段共识别出11种岩相类型。根据电测曲线、录井以及岩相组合的特点,并结合区域沉积背景,研究认为戴南组一段属于辫状河三角洲沉积体系;三垛组一段属于河流沉积体系,其中下亚段为辫状河,上亚段为曲流河。戴南组一段沉积期,曲塘次凹北部断阶带以及曲塘次凹南-东斜坡带、海北次凹南-西斜坡带辫状河三角洲前缘亚相发育,水下分流河道砂体构成了辫状河三角洲前缘亚相的格架。三垛组一段下亚段沉积时期,研究区主要为辫状河河道和洪泛平原亚相沉积,河道内心滩砂体发育;上亚段沉积期演变为曲流河河道、堤岸和泛滥平原亚相沉积,河道凸岸一侧发育边滩微相。辫状河三角洲前缘水下分流河道以及辫状河心滩、曲流河边滩砂体物性较好,是研究区油气富集的有利相带。

关键词: 辫状河, 曲流河, 辫状河三角洲, 沉积特征, 戴南组, 三垛组, 海安凹陷

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

中图分类号:

TE112.1

魏祥峰,张廷山,梁兴,等. 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[J]. 石油与天然气地质, 2012, 33(2): 265-276,301. doi: 10.11743/ogg20120213 Wei Xiangfeng,Zhang Tingshan,Liang Xing,et al. 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. doi: 10.11743/ogg20120213

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