渤海南部海域沙三中段进积体储层定量预测方法与应用

Reservoir Prediction and Application of Progradation Reservoir,E_2S^(3M) Southern Bohai Water

垦利10-1油田位于渤海南部莱州湾凹陷北部,油田依附于长期活动的莱北一号断层发育,是一个被断层复杂化的半背斜构造油藏,主力含油层系为古近系沙河街组和新近系明化镇组。沙三中亚段发育东西向展布的大型辫状河三角洲,进积特征明显,在层拉平的基础上,基于地震剖面反射特征将三角洲进积体划分为六期,在地震剖面上对其进行追踪解释,刻画每期进积体的展布范围;在进积体内部,通过精细地震相分析,将其分为顶积层和前积层,并对其进行精确定边,刻画其分布范围。在此基础上,通过钻井资料的标定,建立了进积体顶积层富砂,前积层富泥的储层发育模式。在顶积层精细刻画的基础上,通过地质模式约束净毛比,计算出进积体内部砂体净厚度,实现了砂体的定量预测。

Kenli 10-1 oilfield is located in the north of Laizhouwan Depression southern part of the Bohai Sea, it developed dependent on the long-term active Fault One of Laizhouwan Depression, which is a half anticline struc- ture oil reservoir complexed by fault, with the Sha Hejie Formation Paleogene and Ming Huazhen Formation Neo- gene as its main oil bearing series. In E2S3M braided-river delta developed in the east wet direction, with typical pro- gradation phenomenon. With the method of layer flattening, the delta progradation body was divided into six parts by the seismic reflection character, by tracing formations interpretation describing the spread range of each prograda- tion body. Inside the progradation body, through refined seismic facies analysis, each progradation body is divided into two parts topset bed and foreset bed, with determining boundary exactly, characterize the distribution range respectively. On this base, through calibrating downhole seismic, establish the model that the topset bed is rich in sand but the foreset bed is rich in mud. On the base of the description of topset bed, using the geological pattern re- strict the N/G ratio, calculate the sand thickness of each progradation, realize the quantitative prediction of sand- body.