基于曲线样式的非常规油层产能评价方法探索

Exploration of Productivity Evaluation Methods Based on Curve Styles in Unconventional Reservoir

歧口凹陷沙河街组湖相碳酸盐岩油层单层厚度小,岩性变化快,过渡岩类多,储层孔隙类型多,结构复杂,物性差,造成测井曲线响应多变而复杂,以往海相块状碳酸盐岩储层和常规砂泥岩储层评价方法不适用。探索利用测井曲线样式与测井直接信息以及储层有效厚度相匹配的产能评价方法,在划分曲线样式的基础上,提取直接测井信息重构储层分类指示曲线,识别有效产层的同时建立基于曲线样式的储层产能分类标准,通过与储层有效厚度结合形成产能评价曲线。该方法在歧口凹陷沙一下泥、微晶云(灰)岩、沙二段砂质云(灰)岩、沙三段泥质云(灰)岩非常规油层中应用效果十分显著。

Abstract. Single layer thickness of lacustrine carbonate reservoir Qikou depression Shahejie is thin, and the lithology changes quickly, there are much more transitional rocks. There are many types of pores and their structures are complex with poor physical properties, resulting in varied and complex response logs. All evaluation methods for marine carbonate reservoir and conventional sand-shale reservoir are not applicable in this area. This paper explores the way of using ＂Curve Styles＂, ＂direct＂ log information and the effective thickness of the reservoir to evaluate production productivity. In the division of the curve styles, we extract logging information directly to reconstruct reservoir classification index curves thus, we identify the effective productivity layers and simultaneously establish the reservoir productivity curve classification criteria based on the curve styles. Finally, the productivity evaluation curves are formed combined with the effective thickness, so achieving the targets of productivity evaluation. This method has been applied in Qikou depression Shahejie lacustrine carbonate reservoir, and achieves good productivity evaluation result.