新疆石油地质

新疆石油地质 ›› 1998, Vol. 19 ›› Issue (5): 383-387.

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断陷湖盆陡坡带陆相层序体系域模式———以泌阳断陷双河—赵凹地区下第三系核三上段为例

胡受权   

  1. 西南石油学院博士后流动站 四川南充 637001
  • 收稿日期:1998-05-26 出版日期:1998-10-01 发布日期:2020-09-19
  • 作者简介:胡受权：博士 油气地质与勘探
  • 基金资助:
    本文系“ 油气藏地质及开发工程” 国家重点实验室开放基金项目(编号:PLN97023)成果之一

SYSTEM TRACT MODEL IN TERRIGENOUS SEQUENCE OF THE STEEP SLOPE ZONE IN FAULT-DEPRESSED LACUSTRINE BASIN—A Case Study :the Upper Member of Eh3, Shuanghe-Zhaoao, Biyang Fault-depression

Hu Shouquan   

  1. Petroleum Institute of Southwest, Nachong, Sichuan 637001
  • Received:1998-05-26 Online:1998-10-01 Published:2020-09-19
  • About author:Hu Shouquan, Doctor, Petroleum Geology

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摘要： 由于断陷湖盆陡坡带的沉积滨线坡折难以识别, 拟以特定井的位置作为参照物, 来划分陆相层序及其体系域。陆相层序中发育齐全的四个体系域具五个界面, 除顶、底界面归属层序界面之外, 其它三个界面皆为体系域界面。低水位体系域以Ⅰ型界面为底界, 以初始湖泛面为顶界,形成于湖平面下降拐点F至最低点L 之间;水进体系域以初始湖泛面为底界, 以凝缩段出现为顶界, 形成于湖平面最低点L至上升拐点R之间;高水位体系域形成于湖平面上升拐点R至最高点H时间段, 其底以凝缩段出现为界, 顶以最大湖泛面为界;水退体系域以最大湖泛面为底界, 顶界为Ⅰ型或Ⅱ型层序边界,形成于湖平面最高点H至下降点F期间。

关键词: 南襄盆地, 泌阳凹陷, 断陷盆地, 陆相, 地层层序, 界面, 模式

Abstract: Because the depositional shoreline break is difficult to recognize in the steep slope zone of fault-depressed lacustrine basin, it has been put forward that the location of specific wells is taken as reference to divide terrigenous sequence and system tract.A complete terrigenous sequence can be divided into 4 system tracts and has 5 boundaries, of which the top and the bottom belong to sequence boundary, and other 3 to system tract boundary.Low stand System Tract(LST)which bottom is a sequence boundary of type Ⅰ and top is first flooding surface formed during the period from the descent inflexion point(F)to the lowest point(L)of lacustrine level change.Trans gressive Systems Tract(TST)which bottom is a first flooding surface and top is marked by the emergence of condensed section formed during the period from the lowest point(L)to the ascent inflexion point(R)of lacustrine level change.High stand Systems Tract(HST)which bottom is marked by the emergence of condensed section and top is a maximal flooding surface formed during the period from the ascent inflexion point(R)to the highest point(H)of lacustrine level change.And Regressive Systems Tract(RST)which bottom is a maximal flooding surface and top is a sequence boundary of type I or type Ⅱ formed during the period from the highest point(H)to the descent inflexion point(F)of lacustrine level change.

Key words: Nanxiang Basin, Biyang sag, Continental facies, Stratigraphy sequence, Boundary, Model