Title: Well Logging Identification of Tight Reservoir in Shuang229 Block
Abstract: Shuang229 block in Western Liaohe Basin is close to Qingshui hydrocarbon generation depression. The main target reservoir of lower sub member of the first member of Shahejie formation ( $$ {\text{E}}_{ 3} {\text{s}}_{ 1}^{ 3} $$ ) is fan delta front underwater branching channel microfacies. The rock types are mainly medium sandstone and fine sandstone, which are of low porosity and ultra-low permeability reservoirs. Affected by the tight characteristics of the reservoir, the reservoir in this block has two types of high resistance and low resistance. The lithology and logging display of the low resistance reservoir is approximately the same as the water layer’s, and the logging response is too similar to identify the oil layer from the water layer. According to the core analysis and logging, oil testing and production testing data, the logging response mechanism of oil layers in tight reservoirs is analyzed in terms of lithology, grain size, shale content and pore structure. Due to the forming mechanism of low resistivity reservoir, the complex pore structure and high irreducible water saturation is caused by its fine lithology, high content of carbonate minerals and clay minerals. Therefore, the identifying oil layer research is based on reservoir characteristics such as lithology, physical property, electrical property etc. Then the identifying log-curve is optimized, the sensitive curve is constructed, the identification intersection chart is established, and the secondary interpretation of the oil layer is carried out. The coincidence rate of logging interpretation is 87.1%. The research ideas and methods can provide technical reference for reservoir identification of the same type of tight reservoir.
Publication Year: 2021
Publication Date: 2021-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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