高精度层序地层学在隐蔽油藏预测中的应用

Application of high-resolution sequence stratigraphy in subtle oil pool prediction.

针对泌阳凹陷地层沉积特点，以高精度地震资料、钻井和测井资料为基础，采用高精度层序地层学方法，通过对不整合面的识别和追踪，建立了泌阳凹陷重点勘探层段下第三系沉积的区域等时地层格架，划分出一级层序界面3个、二级层序界面3个、三级层序界面7个。在三级层序界面控制下，利用踞头剖面和具代表性的钻井资料进行了层序地层和沉积相研究；结合过井高分辨率三维地震剖面，对凹陷中的各井进行了高精度层序地层和沉积相的划分和对比；在单井短期旋回叠加样式的基础上，对中期基准面旋回层序进行了等时对比，建立了高分辨率层序地层格架。在分析层序格架内储层发育规律的基础上，预测了隐蔽油藏的有利勘探区带，并利用地震属性分析技术和地震反演技术对砂砾岩扇体及其分布的边界进行了描述。根据预测结果部署的探井试采均获得了工业油流，新增石油控制储量1092×10^4t。

Aiming at the sedimentary characteristics of Biyang depres- sion,based on the high-resolution seismic data,drilling and logging data,high-resolution sequence stratigraphy was utilized to identify and correlate the unconformity.Areal sequence stratigraphic framework of Biyang depression was built,and the sequence boundaries were divided,including three first-grades,three second- grades and seven third-grades.Under the control of three-grade se- quence boundary,outcrop section and logging data were used to study the formations and sedimentary faceis.Combined with high- resolution seismic sections,the high-resolution sequence stratigra- phy and sedimentary facies were divided and correlated.On the ba- sis of single well analysis,the sequence cycles of middle term base level were correlated and the stratigraphic framework was built. Based on the analysis of reservoir development laws in sequences, the favorable area of subtle oil pools was predicted.In addition, seismic attributes analysis and inversion were used to describe the distri- bution of the glutenite body of steep slope zone.All the prospecting wells deployed according to the prediction results have got industrial oil flow,and the increasing controlled reserve reaches 1092×10~4t.