鄂尔多斯盆地大牛地气田致密低渗储层评价与开发对策

doi:10.11743/ogg20120115

摘要/Abstract

摘要：

鄂尔多斯盆地大牛地气田为典型致密低渗气田,具有低渗、低压、低产的特点,经济有效开发难度大。针对气田不同层段储层开展了储集岩相、岩石学、物性、孔隙结构、含气性等特征研究,在此基础上划分出四大类六小类储层,其中Ⅰ类为高产型储层,Ⅱ类为中产型储层,Ⅲ类为低产型储层,Ⅳ类为非储层。根据不同储层类型及其空间分布的特点,采取了不同的开发策略,Ⅰ类储层物性好、厚度大、单层产量高,采用直井单层开采;Ⅱ类储层物性中等、厚度小、单层产量较低,选择发育两层以上叠合区,采用直井多层合采;对以单层发育的Ⅱ类和Ⅲ类储层,采用水平井分段压裂进行开采。通过不同的开发对策,有效提高了单井产量,实现致密低渗气田的经济开发,目前气田已建成天然气年产能25×10⁸ m³。

关键词: 致密低渗储层, 储层评价, 开发对策, 上古生界, 大牛地气田, 鄂尔多斯盆地

Abstract:

Daniudi gas field in Ordos Basin is typical tight sand gas reservoirs with low permeability,low pressure and low production rate.It has been a challenge to develop this kind of gas field economically.This paper cove- rs lithofacies,lithology,petrophysical property,pore structure and gas bearing potential of different formations.On this basis,four types of reservoirs have been identified.In terms of production rate,TypeⅠis the highest,followed by Type Ⅱand then Type Ⅲ,while Type Ⅳ has no productivity.According to the types and distribution of reservoirs,different development strategies have been adopted.Single layer production through vertical well fits TypeⅠ,whose porosity and permeability are better,net pay is thicker and production rate is higher.Commingled system through vertical well for overlapped layers suits Type Ⅱ,whose porosity and permeability are moderate,net pay is thinner and production rate of single layer is lower.Staged fracturing through horizontal well matches both Type Ⅱand Type Ⅲ with only one widely distributing layer.Applying different development strategies to different types of reservoirs,we has succeeded in improving the individual-well production rate and achieving economical development of this gas field.Annual production capacity of 25×10⁸ m³ has been built up there.

Key words: tight sand reservoir with low permeability, reservoir evaluation, development strategy, Upper Palaeozoic, Daniudi gas field, Ordos Basin

中图分类号:

TE112.3

侯瑞云,刘忠群. 鄂尔多斯盆地大牛地气田致密低渗储层评价与开发对策[J]. 石油与天然气地质, 2012, 33(1): 118-128. doi: 10.11743/ogg20120115 Hou Ruiyun,Liu Zhongqun. Resevoir evaluation and development strategies of Daniudi tight sand gas field in the Ordos Basin[J]. Oil & Gas Geology, 2012, 33(1): 118-128. doi: 10.11743/ogg20120115

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