Controlling effect of the fractures in Upper Ordovician fractures upon reservoir formation at the platform edge of Tazhong oilfield,the Tarim Basin—an example from the Tazhong-Ⅰ slope break zone

Zhou Bo; Jia Chengzao; Gu Jiayu; Li Qiming; Wu Guanghui; Ju Yan

doi:10.11743/ogg20080207

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Controlling effect of the fractures in Upper Ordovician fractures upon reservoir formation at the platform edge of Tazhong oilfield,the Tarim Basin—an example from the Tazhong-Ⅰ slope break zone
Vol. 29, Issue 2, Pages: 198-203(2008)
Online First：24 April 2008，

Published：2008
DOI： 10.11743/ogg20080207
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DOI：

Zhou Bo, Jia Chengzao, Gu Jiayu, et al. Controlling effect of the fractures in Upper Ordovician fractures upon reservoir formation at the platform edge of Tazhong oilfield,the Tarim Basin—an example from the Tazhong-Ⅰ slope break zone[J]. 2008, 29(2): 198-203. DOI： 10.11743/ogg20080207.

摘要

根据岩心、岩石薄片的观察分析

结合阴极发光鉴定技术

确定塔中台地边缘中、上奥陶统灰岩段至少发育3期构造裂缝

其中喜马拉雅期构造裂缝显著改善储层品质.认为岩心上大量微细裂缝的主要作用是提高渗透率

沟通大裂缝与基质孔.研究区储层发育模式强调裂缝对储层发育的控制作用

埋藏溶蚀是造成基质孔隙发育的主要作用

并指出下一步勘探目标是有利沉积相带中的裂缝发育带.

Abstract

Observation and analysis of cores and thin sections

combined with cathodeluminescence identification technique

reveal that at least 3 stages of structural fractures were developed in the Middle-Upper Ordovician limestone formation at the platform edge

Tazhong oilfield.Among the fractures

the one formed in Himalaya pe-riod had greatly improved the quality of reservoirs.It is suggested that the numerous tiny to small fissures in cores could enhance permeability and connect larger fractures with matrix pores.The authors present in this paper the model of reservoir formation which emphasizes the controlling roles of fractures to reservoir formation

and regard burial dissolution as the main mechanism of matrix pore growth.They also point out that the future exploration targets in the basin shall be fractures in the favorable sedimentary facies belt.