等时地层模型控制下的砂砾岩体岩相预测

Lithofacies prediction of glutenite body controlled by isochronous stratigraphic model

砂砾岩体是陆相断陷湖盆陡坡带广泛发育的岩性类型,亦是东营凹陷最重要的一种增储上产储层类型.地质上,该类沉积储层非均质性强,不同相带储层物性差异大,油气分布相控特征明显;地震上,砂砾岩体内幕反射杂乱、空白,成层性差,空间上识别可靠的等时地层界面困难,导致后期有利相带、储层描述精度低,失去了沉积学理论基础和方法支持.本次研究创新在井震频谱分析、Fischer曲线和耦合系数三因子联合井震标定基础上,探索形成了EMD地震层序格架约束下的基于价值函数的等时地层模型建立方法,客观快速的建立了研究区三维相对地质年代模型,极大提高了砂砾岩体层序划分精度,并在该模型约束下通过门槛值约束敏感属性融合法对影响砂砾岩体非均质性的岩相进行了预测,实现了油气优势相带精细刻画,有效指导了砂砾岩体井位部署及后期开发方案编制.

Glutenite body is a widely developed lithologic type in the steep slope zone of continental faulted lacustrine basin and is also one of the most important reservoir type for production increasing in Dongying Sag. Geologically, this type of reservoir has strong heterogeneity, great difference in physical properties and obvious characteristics of facies-controlled oil and gas distribution. Seismographicly, it is difficult to identify reliable isochronous strata interfaces for disordered and blank reflection, which leads to low accuracy for facies and reservoir description, and loses the theoretical basis and method support of sedimentology. In this thesis, a new well seismic calibration method controlled by well-seismic spectrum analysis, Fischer curve and coupling coefficient is established, the method of establishing isochronous stratum model based on value function under the constraint of EMD seismic sequence framework is explored, the three-dimensional relative geological age model of the study area is established objectively and rapidly, which greatly improves the accuracy of sequence division of the glutenite body and, the lithofacies which influence the heterogeneity of the glutenite body are predicted within the constraint of the model by the superposition of sensitive attributes, and the fine characterization of the dominant facies belts of oil and gas is realized. It has effectively guided the well location deployment and development program preparation.