Reservoir Architecture Modeling of Complex Meandering Belts: A Case of Gudao Oilfield, Bohai Bay Basin, East China

Shenghe Wu¹, Dali Yue¹, and Jianmin Liu^2
1Resource & Environment, China Petroleum University, Beijing, China
²Development Department, Shengli Oilfield Company,Sinopec, Dongying, China

This paper is aimed at architecture modeling method of complex meandering belt reservoir taking upper Tertiary of Gudao Oilfield of Jiyang Depression of East China as an example. The oilfield is now in the development stage of high water-cut and low oil recovery, with 100m well space.

The modeling procedure is hierarchical. The complex meandering belt is first separated into several single meandering belts, which are then subdivided into different point bars and abandoned channels, in turn lateral-accretion bodies are identified within a point bar. The key method,called pattern-matching method is proposed which includes two key points.(1) Recognition of quantitative architectural pattern. The scale of single abandoned channel and point bar is calculated through empiristic formula induced from survey of modern meandering rivers.The result shows that in study region width of abandonded channel is about 150m, and that of point bar about 900m. The scale of lateral-accretion body is obtained through cored well, horizontal well and couple well data.(2)Matching of well data to pattern. Firstly, couple the same architectural units among wells to create a elementary model. Secondly, optimize the model through annealing simulation and interactive method according to quantitative scale of architectural elements, making the final model to fit simultaneously the well data and pattern. The 3D distribution of abandoned channel shale and inclined accretion shale within point bars that influence the oil-water flow and remaining oil distribution in reservoir, is reflected well in the created model. 3D reservoir numerical simulation based on the created model shows the study result fits well to performance, that affirms the proposed hierarchy modeling method is effective to complex meandering belt reservoir.

AAPG Search and Discovery Article #90078©2008 AAPG Annual Convention, San Antonio, Texas