神泉油田侏罗系油藏“夹层水”成因分析

THE ANALYSIS OF THE GENESIS OF "INTERBEDDED WATER" IN CRETACOUS RESERVOIR IN SHENQUAN OILFIELD

神泉油田侏罗系油藏是一个小型的复杂断决油藏。其构造整体上是一个宽缓穹隆,被多条断层分割成多个小断块;储集层为多层薄互层状发育的砂岩,单井钻遇的砂层数多达15～45个,单砂层平均厚度小于2m,砂体平面分布稳定性差,多呈条带状及透镜状。在油田勘探及产能建设过程中,发现该油藏油水关系较为复杂,油水关系与传统统一的水动力学系统的认识有较大的矛盾,存在着"夹层水"的现象,给油藏认识带来了困难。本文在小层精细对比的基础上,通过地质录井、测井、试油、生产特征等资料的研究,对"夹层水"的存在成因进行了深入的分析,并指出了认识"夹层水"存在的地质意义,对油田继续滚动扩边及其它相似油田的勘探开发具有一定的借鉴作用。

The Cretaceous reservoir in Shenquan Oilfield is a small complex fault - block reservoir. Its structure which is a gently broad dome on the whole is separated by several small faults into many small blocks. The reservoir is multilayer sandstone in thin alternating beds interbedding. The number of sandstone beds penetrated in a well reaches 15 to 45 and the average thickness of single layer is less than 2 meter. The sand body distribution is mainly in banded or lens shape. During the exploration and productivity construction, the complex oil - water relation is conflict with the result gained from traditional hydrodynamics theory. The existence of 'interbedded water' makes it difficult to understand the reservoir. On the basis of the beds fine correlation, the genesis of 'interbedded water' is deeply analyzed through the investigation of geological log data, logging data, well test data and producing performance and pointed out the importance of understanding 'interbedded water'. This paper can be a reference for the following folling development of the oil field and the exploitation of similar oil field.