鄂尔多斯盆地延长组长8油层组砂体结构特征及成因机理

doi:10.7623/syxb201303003

石油学报 ›› 2013, Vol. 34 ›› Issue (3): 435-444.DOI: 10.7623/syxb201303003

鄂尔多斯盆地延长组长8油层组砂体结构特征及成因机理

李士祥^1,2,3, 楚美娟^2,3, 黄锦绣^2,3, 郭正权^2,3

1. 成都理工大学能源学院四川成都 610059;
2. 中国石油长庆油田公司勘探开发研究院陕西西安 710018;
3. 低渗透油气田勘探开发国家工程实验室陕西西安 710018

收稿日期:2012-10-08 修回日期:2012-12-18 出版日期:2013-05-25 发布日期:2013-04-09
通讯作者: 李士祥
作者简介:李士祥,男,1981年6月生,2003年获长江大学学士学位,2006年获长江大学矿产普查与勘探专业硕士学位,现为成都理工大学能源学院博士研究生,主要从事沉积学及油气地质研究。Email:sxlee1981@tom.com
基金资助:
国家重大科技专项(2011ZX05044,2011ZX05001-004)资助。

Characteristics and genetic mechanism of sandbody architecture in Chang-8 oil layer of Yanchang Formation, Ordos Basin

LI Shixiang^1,2,3, CHU Meijuan^2,3, HUANG Jinxiu^2,3, GUO Zhengquan^2,3

1. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;
2. Research Institute of Exploration & Development, PetroChina Changqing Oilfield Company, Xi’an 710018, China;
3. National Engineering Laboratory for Exploration & Development of Low-Permeability Oil & Gas Fields, Xi’an 710018, China

Received:2012-10-08 Revised:2012-12-18 Online:2013-05-25 Published:2013-04-09

摘要/Abstract

摘要：

鄂尔多斯盆地延长组长8油层组主要发育典型的浅水三角洲沉积。在前人对物源、湖盆底形、碎屑供给能力、水体能量等沉积条件研究的基础上,通过对沉积特征的分析,长8油层组发育西南部和西北部的辫状河三角洲沉积、东北部的曲流河三角洲沉积和西部的扇三角洲沉积,分流河道砂体和水下分流河道砂体为主要的储集体类型。勘探实践证明,不同沉积体系区域其砂体储集性能存在明显差异,盆地西北部和西南部地区砂体储集性能较好,已发现了规模储量,而东北部地区砂体储集性能差,未发现规模储量,砂体结构的不同是造成其储集性能差异的主要原因。在对砂体垂向及横向解剖的基础上,通过对砂体成因机理的分析,将长8₁段砂体主要划分为分流河道型和分流砂坝型2种类型。分流河道型砂体主要发育在盆地的西部地区,是在近物源、高能量、物源供给充足的条件下,河流入湖后河道的能量大于湖水的顶托作用,河道继续向前延伸,形成条带状的厚层垂向叠置砂体。分流砂坝型砂体主要发育在盆地的东北部地区,是在坡缓水浅、远物源、低能量的缓慢沉积条件下,湖水能量和河道入湖能量彼此强弱交替,形成了呈朵叶状的、单层厚度薄且不连续的砂体。

关键词: 砂体结构, 砂体类型, 成因机理, 长8油层组, 延长组, 鄂尔多斯盆地

Abstract:

A typical shallow-water delta deposit developed in Chang-8 oil layer of Yanchang Formation, Ordos Basin. Based on previous studies of sedimentary conditions such as provenance analysis, basin bottom configuration, clastic supply capacity and water energy, we examined sedimentary characteristics of Chang-8 oil layer of Yanchang Formation and concluded that Chang-8 oil layer has a developed braided-river delta deposit in the southwestern and northwestern areas of Ordos Basin, a meandering river delta deposit in the northeastern area and a fan delta deposit in the western area. Distributary-channel sandbody and subaqueous distributary-channel sandbody are main reservoir types of these deposits. The practical exploration proved that different sedimentary system areas have significant differences in reservoir property. For instance, the reservoir property of sandstones is better in the northwestern and southwestern areas of the basin, where a considerable scale of reserves has been discovered. However, the reservoir property of sandstones is poor in the northeastern area, where no commercial scale of reserves is found. Herein the main reason for reservoir property differences is attributed to different sandbody architectures. Based on vertical and horizontal anatomy of these sandbodies, we divided the upper part sandbodies of Chang-8 oil layer in Yanchang Formation into distributary channel and distributary sand-dam types by analyzing the genetic mechanism of sandbodies. The study demonstrated that the distributary channel sandbody, developing mainly in the western area of the basin, is formed under conditions of proximal material source, high-energy and sufficient material supply when the channel energy is greater than the jacking force of lake water upon a river entering a lake, and the river channel continues extending forward to form banded, vertical-stacking thick sandbodies. While the distributary sand-dam sandbody, developing mainly in the northeastern area of the basin, is formed under conditions of slow slope, shallow water, distal material source, low energy and slow deposition when the channel energy entering a lake is alternately equivalent to that of lake water, and the river channel forms lobate, discontinuous and thin-layered sandbodies.

Key words: sandbody architecture, sandbody type, genetic mechanism, Chang-8 oil layer, Yanchang Formation, Ordos Basin

中图分类号:

TE111.3

李士祥, 楚美娟, 黄锦绣, 郭正权. 鄂尔多斯盆地延长组长8油层组砂体结构特征及成因机理[J]. 石油学报, 2013, 34(3): 435-444.

LI Shixiang, CHU Meijuan, HUANG Jinxiu, GUO Zhengquan. Characteristics and genetic mechanism of sandbody architecture in Chang-8 oil layer of Yanchang Formation, Ordos Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(3): 435-444.

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鄂尔多斯盆地延长组长8油层组砂体结构特征及成因机理

Characteristics and genetic mechanism of sandbody architecture in Chang-8 oil layer of Yanchang Formation, Ordos Basin

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