高含水开采阶段储层精细划分与对比——以东营凹陷梁11断块沙二段为例

Reservoir subdivision and correlation at high water cut stage——taking Es_2 formation of Liang 11 fault block of Dongying Depression as an example

针对油田高含水开采阶段水淹不均衡、剩余油分布不明确等问题,提出了储层精细划分的思路与方法。以高分辨率层序地层学为指导,充分利用岩心、粒度分析、测井及数字处理成果,对东营凹陷梁11断块沙二段进行了准层序组及准层序分析;应用旋回对比、分级控制原理实现了小层及单砂层划分与对比;应用储层层次界面理论对沙二段7和8砂层组进行了单砂层内部成因体的识别、划分与对比。将研究区沙二段7和8砂层组的7个小层划分为20个单砂层,并且将其中的8个重点砂层划分出18个成因体,为油藏数值模拟及剩余油分析提供了可靠的地质依据。

In view of the problems of flooding disproportion and undefined remaining oil distribution and so on during the high water cut stage,the procedure and method of reservoir subdivision and correlation were put forward. Analyzing the core,grain size analysis,log data and digital processing results synthetically,the units of the parasequence set and parasequence were divided in Es2 formation of Liang 1 1 fault block,Dongying Depression according to the basic principles of high-resolution sequence stratigraphy. A sand bed can be divided and correlated by 'cycle contrast,classification control' method. And based on the theory of hierarchy interface,the genetic subunits in single sand bodies were recognized ,classified and correlated for No. 7 and 8 sand sets in Es2 formation ,which were divided into 20 small single-sands. Among those 8 main sands were divided into 18 genetic subunits. The research can provide reliable geological basis for reservoir numerical simulation and the remaining oil analysis.