苏里格气田非均质储层气藏形态边界刻画技术研究

Study on the characterization of heterogeneous gas reservoir boundary in Sulige gas field

苏里格气田目的层盒8段、山1段储层不但表现为低孔低渗特点,而且储层纵向和横向的非均质性非常强(孔隙度2%~15%,平均8%;渗透率0.1~1.5 mD,平均0.5 mD),气藏边界刻画难度大.以往对该区的气藏边界刻画主要是通过叠前地震反演进行定性的预测,或者利用测井资料结合地质认识通过地质建模进行简单粗略的刻画,此两种方法都无法满足苏里格气田“少井高效”的开发战略需求.本文在查阅大量相关资料文献的基础上,结合苏里格气田特点,提出气藏边界定量刻画技术方法,即通过地震、地质、测井等多学科联合开展相控属性建模,结合苏里格气田的工业气藏参数标准,从储量的角度提出气藏边界定量刻画技术.该技术在后续的开发项目推广应用中,经钻井证实效果显著,适用于苏里格气田的高效开发.

The reservoir of the target strata(He8 and Shan1 section)in the Sulige gas field has such features as low porosity(2%~15%,average 8%)and low permeability(0.1~1.5 mD,average 0.5 mD).It is difficult to describe the boundary of gas reservoir.In the past,gas reservoir boundary in the area is predicted qualitatively by pre-stack seismic inversion or roughly described by geological modeling,which uses well logging data and geological knowledge.These methods cannot meet the requirements about deployment strategy of Changqing Oil field“less wells,higher efficiency”.In this paper,on the basis of consulting a large number of relevant documents and combining with the characteristics of gas field,quantitative description technology method of gas reservoir boundary is put forward.Based on the comprehensive research of seismic,geology and drilling,facies-controlled geological modeling is carries on.And combining with the parameters standard of the industrial gas reservoir in the Sulige gas field,the boundary of gas reservoir is described detail qualitatively.After the technology being used in the subsequent development project,it is proved to be effective by drilling.So it is suitable for the efficient development of the Sulige gas field.