ORIGIN AND CHARACTERISTICS OF UNDER PRESSURE SYSTEMS IN DONGYING DEPRESSION

Liu Xiaofeng; Xie Xilong

doi:10.11743/ogg20020114

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ORIGIN AND CHARACTERISTICS OF UNDER PRESSURE SYSTEMS IN DONGYING DEPRESSION
Vol. 23, Issue 1, Pages: 66-69(2002)
Online First：25 March 2002，

Published：2002
DOI： 10.11743/ogg20020114
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DOI：

Liu Xiaofeng, Xie Xilong. ORIGIN AND CHARACTERISTICS OF UNDER PRESSURE SYSTEMS IN DONGYING DEPRESSION[J]. 2002, 23(1): 66-69. DOI： 10.11743/ogg20020114.

摘要

钻井测试证实:东营凹陷的边缘凸起带、盆倾断裂带及中央隆起带发育有低压油气藏。边缘凸起带上的低压层多分布于小于2000m的浅层;隆起带上的位于2000m以下的深层;在盆缘断裂带

深、浅层均有分布。轻烃的扩散作用、流体(油气)沿断裂和不整合面的压力释放作用及因盐度差引起的渗流作用是低压形成的主要原因。东营凹陷不仅气藏具有低压异常

而且在稠油油藏和常规油藏中也有广泛的分布。气藏及稠油油藏的低压多集中于2000m以上的浅层

常规油藏的低压则多集中于2000m以下的深层。

Abstract

Data derived from DST(Drill Strata Test)suggest that low pressure systems developed in Dongying Depression.The low pressure oil and gas reservoirs are usually located in the marginal uplift zone

marginal fault zone and central uplift zone.The low pressure system in the marginal uplift zone is shallower than 2000 m;in the central uplift zone

it is distributed in the strata deeper than 2000 m;and near the marginal fault zone

it developed in both shallow and deep strata.The distribution of low pressure was determined by the origin mechanesms.The main causes of the low pressure origins were diffusion of light hydrocarbons

pressure release resulting from quick fluid and hydrocarbon escape along faults and surfaces of unconformities

and osmosis due to salinity differences.The low pressure anomaly does not only exist in gas pools in the depression

but also in heavy oil pools and normal oil pools.