摘要
鄂尔多斯盆地苏里格气田属于典型的致密砂岩气藏,储层非均质性强、提交储量时样本数据有限,储量计算结果存在一定的误差。以苏里格气田14区块盒8段、山1段致密砂岩气藏为研究对象,提出以储层地质知识库为约束的储量复算思路与方法。以气田密井网区储层地质知识库为指导,对研究区有效储层进行精细描述,刻画含气边界的基础上,按照"平面分单元、纵向分小层"的思路,采用容积法对储量进行复算。此外,依据累计产气量、储量丰度及内部收益率对储量进行综合分类评价。复算结果表明,含气面积和储量丰度的减小引起复算储量减少,含气面积减小是储量减少的主要原因;稀井网砂体边界控制产生的误差、井间砂体减薄尖灭及储层的非均质变化共同引起含气面积的减小。评价结果证实区块储量物质基础落实,具备较长期稳产的资源基础。
It is a typical tight sand gas reservoir with strong heterogeneous in Sulige Gasfield, Ordos Basin. The proved reserve,which has been calculated with volumetric method,is inaccurate due to the limited da- ta.In this paper,with strongly inhomogeneous tight sandstone gas reservoir in He8 and Shanl member of Su 14 block in Sulige Gasfield as the study objective,we put forward the method of recalculating reserves confined by database of geological knowledge about reservoir. Based on geological knowledge database es- tablished by analyzing reservoir architecture of wells in infill drilling pilot,we described the geometry and boundary of effective reservoir sand body.According to the thought ＂dividing the reservoir into units hori- zontally and minor layers vertically＂, the reserves were recalculated with volumetric method. In addition, the reserves were classified and evaluated synthetically according to the cumulative output of gas well,re- serves abundance and internal rate of return （IRR）.The result shows that the recalculated reserves reduced due to the decrease of gas bearing area and the abundance of reserves. The decrease of gas bearing area, which was caused by the sand body thinning to cutting up, the errors due to the incomplete well pattern and the inhomogeneous of reservoir,is a main reason for reserves reduction.The recalculation and evalua- tion show that the material base of reserve in the study area is solid, and it can maintain stable production for a long time.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2017年第9期1322-1329,共8页
Natural Gas Geoscience
基金
国家科技重大专项"鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程"(编号:2016ZX05050)
中国石油天然气股份有限公司科技专项"长庆气田稳产及提高采收率技术研究"(编号:2016E-0509)联合资助
关键词
致密砂岩气藏
地质知识库
储量复算
分类评价
Tight sandstone gas reservoir
Geological knowledge database
Reserves recalculating
Classified evaluation
