南堡凹陷北部沙三段岩性圈闭识别与评价

Lithologic Trap Identification and Evaluation in the Third Member of Shahejie Formation in Northern Nanpu Sag

在南堡凹陷层序地层学研究的基础上,充分利用钻井、测井、岩心分析等资料,对三维地震数据体进行三级层序界面解释、沿层序解释界面分时窗进行地震属性提取、地震属性特征分析,确定了有利的岩性圈闭发育区,并在三级层序解释界面的控制下,根据不同体系域砂体的发育类型,运用储层反演、速度场分析等方法对岩性圈闭的物性特征、含油性等进行综合评价后,确定了有利岩性圈闭。通过南堡凹陷北部沙三段岩性圈闭识别与评价实践,在南堡凹陷北部沙三段识别出有利岩性圈闭20个,并通过综合评价提出了9口井的井位,确定了该区岩性油气藏勘探的基本思路,指明了该区油气勘探的方向,对该区岩性油气藏的勘探评价具有重要的指导意义。

Based on the research of sequence stratigraphy in Nanpu Sag as well as the analysis of drilling,logging and core data,the third order sequence interface was interpreted.Besides,the seismic attribute characters were extracted and analyzed within the time window along the sequence boundary.Then,the profitable lithologic trap was defined by using the reservoir conversion and velocity field method analysis to evaluate the character of lithologic trap and oil bearing condition under the control of the third order sequence boundary according to the sand body types research in different system tracts.And 20favorable lithologic traps are identified in the third member of Shahejie Formation in northern Nanpu Sag according to the identification and evaluation of lithologic reservoirs in this area,and nine traps are chosen for drilling.What's more,the idea for exploration is established,which is a significant orientation for the oil-gas exploration and evaluation.