POOL-FORMING CONDITION AND ACCUMULATION REGULARITY OF OILS AND GASES IN BIYANG DEPRESSION,NANXIANG BASIN

Wang Min; Qin Weijun; Zhao Zhui; Yu Peixiang

doi:10.11743/ogg20010219

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POOL-FORMING CONDITION AND ACCUMULATION REGULARITY OF OILS AND GASES IN BIYANG DEPRESSION,NANXIANG BASIN
Vol. 22, Issue 2, Pages: 169-172(2001)
Online First：25 June 2001，

Published：2001
DOI： 10.11743/ogg20010219
稿件说明：

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DOI：

Wang Min, Qin Weijun, Zhao Zhui, et al. POOL-FORMING CONDITION AND ACCUMULATION REGULARITY OF OILS AND GASES IN BIYANG DEPRESSION,NANXIANG BASIN[J]. 2001, 22(2): 169-172. DOI： 10.11743/ogg20010219.

摘要

泌阳凹陷是南襄盆地中的一个次级构造单元

为一南断北超式箕状凹陷.核桃园组沉积时期为凹陷的主要断陷期

深凹区形成了巨厚的生储盖组合及3大类9亚类油气藏.目前发现的油气藏均围绕生油凹陷呈环状分布

由浅至深

分别为稠油、正常油和凝析气藏.因凹陷北部为一长期抬升的继承性斜坡

为油气大规模运移的指向区

所以该区为油气的主要富集区.区内的两组断裂为油气藏的形成提供了良好的遮挡条件

有利于形成断鼻、断块油藏.核桃园组三段的厚层泥岩为该凹陷的区域性盖层

油气藏均分布于此泥岩段之下.

Abstract

Biyang Depression is a secondary structural unit in Nanxiang Basin. The depression is in half-graben shape which faulted in the south part and overlapped in the north part. The depositional stage of Hetaoyuan Formation was the major fault-subsided stage of the depression

source-reservoir-cap rock assemblage with great thickness and three types and nine subtypes of oil-gas pods formed in the deep depressed area. The discovered oil and gas pools are distributed in circularity around the depression. From shallow to deep of the depression

the oil pools change from dense oil gas to normal and then condensed oil pools. The inherited depression in the north part of the slope is the major oil-gas enriching area

the two sets of fractures within the area are favourable for the formation of fault-noze and fault-block oil pools. The thick mudstone of the third member of Hetaoyuan Formation is regional cap rock of the pools.