渤海蓬莱区块有利油层段预测方法研究

Study of the Methods to Predict Favorable Oil Reservoir Section in Bohai Penglai Block

蓬莱区块位于渤海盆地东部一箕状洼陷的斜坡边缘,其位于郯庐断裂转换部位,断裂样式复杂多样,多期次活动,其对油气成藏的影响也较大。通过对研究区断裂分级,研究该区的断裂组合模式和不同断块间断层活动性差异,指出不同断裂组合和断层活动差异性对油气成藏的控制作用,得出北区是油气成藏的富集区。同样利用叠后烃检技术,对该区块进行研究,利用神经网络在测井约束下的饱和度反演方法,预测出的有利含油层段与地质方法预测出的区块完全一致,并得到钻井证实。两种方法的结合应用在蓬莱区块油藏评价中发挥了较好的指导意义。

Penglai Block is located on the edge of slope in a half graben-like sag,in the eastern part of Bohai basin,at the transform part of Tanlu fault.The faulting styles are various and complex,and faulting activity is multiphase,which have great influence on hydrocarbon accumulation.In this paper,through classification on faults in the study area,study has been conducted on the fault combination mode and difference in fault activity in different blocks.It has been pointed out that different fault combination modes and difference in fault activity in different blocks are the main controlling factors on hydrocarbon accumulation.It is predicted that the north block is hydrocarbon enrichment area.Furthermore,by using post-stack hydrocarbon detection method and saturation inversion method in logging controlled neural network,favorable oil bearing sections have been predicated,which is matched perfectly with predication results with geological method.The forecast results have been confirmed by drilling results.Overall,comprehensive application of above study methods is very useful in reservoir evaluation in Penglai Block.