东部凹陷大平房地区沙河街组沙三上亚段沉积相特征
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摘要
辽河盆地东部凹陷大平房地区沙河街组沙三上亚段是深凹带的主要勘探目的层,且具有油气成藏的基本地质条件,通过预测有利储集相带,为下步勘探部署提供依据。利用钻井资料,结合地震、测井资料,开展了沉积构造及组合特征研究,该区沙河街组沙三上亚段主要发育有7种主要岩相类型。大平房地区沙河街组沙三上亚段主要发育辫状河三角洲(辫状河三角洲平原亚相、辫状河三角洲前缘亚相)和近岸水下扇沉积,以辫状河三角洲前缘为沉积主体,广泛分布于研究区西部。研究沙三上亚段的沉积相垂向演化特征和沉积相平面展布特征,为有利勘探区研究提供依据。
The upper submember of the third Member of the Shahejie Formation in the Dapingfang area of eastern depression is a major exploration target of deep sag zone,and has fundamental geological conditions of hydrocarbon accumulation.In order to provide basis for further disposition of exploration work,the predictive work for favorable reservoir facies was carried out.Drilling data,seismic and logging data were used to study the sedimentary structures and their combined features.It was recognized that there were 7 kinds of deep-water sediments developed at the upper submember of the third Member of the Shahejie Formation in this area.In fact,the formation at mainly developed braided river delta(braided river delta plain subfacies,braided river delta front subfacies) and the nearshore subaqueous fans.Braided river delta front subfacies mainly occurred in the west of studied area.The vertical evolution feature and the plan distribution of sedimentary facies of the formation were studied and outlined,which provided basis for favorable exploration areas in the future.
The upper submember of the third Member of the Shahejie Formation in the Dapingfang area of eastern depression is a major exploration target of deep sag zone,and has fundamental geological conditions of hydrocarbon accumulation.In order to provide basis for further disposition of exploration work,the predictive work for favorable reservoir facies was carried out.Drilling data,seismic and logging data were used to study the sedimentary structures and their combined features.It was recognized that there were 7 kinds of deep-water sediments developed at the upper submember of the third Member of the Shahejie Formation in this area.In fact,the formation at mainly developed braided river delta(braided river delta plain subfacies,braided river delta front subfacies) and the nearshore subaqueous fans.Braided river delta front subfacies mainly occurred in the west of studied area.The vertical evolution feature and the plan distribution of sedimentary facies of the formation were studied and outlined,which provided basis for favorable exploration areas in the future.
引文
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