叠前反演技术在辫状河三角洲前缘储层预测中的应用

Application of Pre-stack Inversion Technology in Reservoir Prediction of Braided River Delta Front

辫状河三角洲是介于河流三角洲和扇三角洲之间的一种类型,是有利的油气储集带,常发育构造或岩性油气藏。由于辫状河三角洲前缘储层一般单层砂体厚度较薄,而且横向厚度变化较大,储层与围岩岩石物理特征不易区分,为储层预测及油气检测工作带来困难。以渤海湾盆地某区块辫状河三角洲前缘储层为例,通过岩石物理敏感参数构建、精细反演初始模型建立等关键技术研究,利用叠前反演技术对辫状河三角洲前缘砂体的展布形态和范围、储层流体性质进行预测,较好解决了辫状河三角洲前缘亚相砂体的储层预测及流体检测技术难题。

Braided river delta is a type between river delta and fan delta,which is a favorable oil and gas reservoir zone and often develops structural or lithological oil and gas reservoirs.Due to the thin thickness of the single layer sand body in the front edge of the braided river delta reservoir and the significant variation in lateral thickness,it is difficult to distinguish the physical characteristics of the reservoir and surrounding rock,which poses difficulties for reservoir prediction and oil and gas detection.This article takes the braided river delta front reservoir in a certain block of the Bohai Bay Basin as an example.Through the construction of rock physics sensitive parameters and the establishment of fine inversion initial models,key technologies are studied.Pre-stack inversion is used to predict the distribution form and range of the braided river delta front sand body,as well as the fluid properties of the reservoir.This effectively solves the technical problems of reservoir prediction and fluid detection for the braided river delta front subfacies sand body.