Development characteristics and main controlling factors of the Ordovician carbonate karst in Tahe oilfield

Qi Lixin; Yun Lu

doi:10.11743/ogg20100101

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Development characteristics and main controlling factors of the Ordovician carbonate karst in Tahe oilfield
Vol. 31, Issue 1, Pages: 1-12(2010)
Online First：25 February 2010，

Published：2010
DOI： 10.11743/ogg20100101
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DOI：

Qi Lixin, Yun Lu. Development characteristics and main controlling factors of the Ordovician carbonate karst in Tahe oilfield[J]. 2010, 31(1): 1-12. DOI： 10.11743/ogg20100101.

摘要

塔河油田中-下奥陶统缝洞型储层是加里东中期—海西早期多次构造运动引起的多期岩溶作用叠加改造的结果。结合地质、地球物理和地球化学等分析方法

论述了塔河油田奥陶系碳酸盐岩多期岩溶发育特征及其主控因素

揭示了加里东中期第一幕、第二幕、第三幕和海西早期4个主要岩溶发育阶段

解析了岩溶储层成因演化过程及改造历史

研究认为海西早期及加里东中期第一、第二幕为主要岩溶时期

特别是海西早期最为重要

岩溶发育的主控因素是古构造、岩溶地貌及古水系地质环境。

Abstract

The Middle and Lower Ordovician fractured-vuggy reservoirs in the Tahe oilfield experienced multi-stage karstification caused by multi-stage tectonic events from the Middle Caledonian to the Early Hercynian.Based on integration of geological

geophysical and geochemical data

we discuss the development characteristics and main controlling factors of multi-stage karstification of the Ordovician carbonates in the Tahe oilfield.Four main periods of karstification are identified as follows:the 1

Phase

Phase and 3

Phase of the Middle Caledonian and the Early Hercynian.The origin

evolution and transformation history of the karst reservoirs are also discussed in this paper.According to this study

the major karstification periods are the Early Hercynian

the 1

Phase and the 2

Phase of the Middle Caledonian

of which the Early Hercynian is the most important period.The main controlling factors of kastification are paleostructures

karst topography and geological conditions of paleo-drainage-system.