Relationship between characteristics of fracture belt and productionof Keshen 2 gas reservoir in Kelasu tectonic zone,Tarim Basin
Received date: 2016-06-15
Revised date: 2016-09-14
Online published: 2017-01-10
As the main gas producing zone,the Cretaceous Bashijiqike Formation of Keshen 2 gas reservoir in Kelasu tectonic belt of Kuqa Depression features in high depth and poor matrix properties.The development of fractures has large influence on gas production.The characteristics of fractures developed in single well have a big difference both in vertical and horizontal.At present,it is still lack of research on the relationship of fracture characteristics and production,which can guide the deployment of high-producing well effectively.In this paper,the research of characteristics and formation mechanism of fracture belt has been carried out in Keshen 2 gas reservoir,using the data of core,FMI loging,geostress,and test.The relationship between fracture belts with different genesis and production also has been discussed,and several suggestions on reservoir reconstruction have been given.The results obtained in this research are as follows:①According to the fracture occurrence,features in Keshen 2 gas reservoir can be divided into longitudinal fracture belt,mesh fracture belt,transfer structure zone in the space.Longitudinal fracture belt in the space is nearly E-W.Transfer structure zone is nearly S-N direction.Mesh fracture belt always has multiple direction.②The gas production is not always higher with bigger linear density of fracture in the plane in Keshen 2 gas reservoir,which is affected by drilling fluid system,thickness of uncovered reservoir and image quality three aspects.③The three kinds of fracture belt in Keshen 2 gas reservoir are controlled by neutral plane and transfer structure zone.④According to the drilling data,geological data,test data,tectonic location and composition relationships of the three fracture belt in the space,the well spacing area in Keshen 2 gas reservoir can be divided into four levels,which can provide a theory for the future well deployment in Keshen 2 gas reservoir and the similar gas reservoir.
Zhou Peng,Tang Yan-gang,Yin Hong-wei,Zhao Shuang-feng,Mo Tao,Zhang Xing,Zhu Wen-hui,Li Chang-sheng . Relationship between characteristics of fracture belt and productionof Keshen 2 gas reservoir in Kelasu tectonic zone,Tarim Basin[J]. Natural Gas Geoscience, 2017 , 28(1) : 135 -145 . DOI: 10.11764/j.issn.1672-1926.2016.11.028
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