基于储层地质知识库约束的致密砂岩气藏储量评价——以鄂尔多斯盆地苏里格气田苏14区块为例

发布时间：2019-04-09 12:46

【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。
[Abstract]:Sulige gas field in Ordos Basin is a typical tight sandstone gas reservoir with strong heterogeneity and limited sample data at the time of submitting reserves. There are some errors in the calculation of reserves. Taking tight sandstone gas reservoirs in Block 14 and Block 1 of Sulige gas field as research objects, the idea and method of reserve re-calculation constrained by reservoir geological knowledge base are put forward. Guided by the reservoir geological knowledge base in the dense well network area of the gas field, the effective reservoir in the study area is described in detail and the gas-bearing boundary is described. According to the idea of "plane sub-unit and longitudinal sub-layer", the reserves are calculated by volume method. In addition, based on cumulative gas production, reserves abundance and internal rate of return for comprehensive classification and evaluation of reserves. The re-calculation results show that the reduction of gas-bearing area and reserve abundance results in the reduction of recalculated reserves, and the decrease of gas-bearing area is the main reason for the reduction of reserves. The error caused by the boundary control of the sand body in the sparse well, the thinning and sharpening of the inter-well sand body and the heterogeneity change of the reservoir together result in the decrease of the gas-bearing area. The evaluation results confirm that the block reserves material basis is implemented and has a long-term stable production resource base.
【作者单位】：中国石油长庆油田分公司苏里格气田研究中心;低渗透油气田勘探开发国家工程实验室;中国石油长庆油田分公司勘探开发研究院;
【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
【分类号】：P618.13

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