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Characteristics and genesis of low-permeability reservoir,4-7 sand sets of the upper 2nd member of Shahejie group in south of Pucheng Oilfield
WANG Xi-bin1,ZHONG Jian-hua2
(1. College of Petroleum Engineering in China University of Petroleum,Dongying 257061,Shandong Province,China ;2. Faculty of GeoResource and Information in China University of Petroleum,Dongying 257061,Shandong Province,China)
Abstract:
The strata of 4-7 sand sets of upper 2nd member of Shahejie group in south of Pucheng Oilfield are deposited in delta frontal facies of limited terrigenous faulted-depression lake. Reservoir characteristics and its genesis of low-permeability were studied by means of core observation and description, sections, cast sections, scanning electron microscope(SEM) and core lab analysis data. The results indicate the reservoir is characterized by low-permeability, low compositional and structural maturity, abundant plastic lithic fragment and matrix. The diagenesis may be ascribed to the A1 sub-stage of late dia~ genetic stage. Sedimentation has deciding effect on the forming of the low-permeability reservoir. It results in forming low-porosity and low-permeability reservoir directly, and makes the reservoir compacted easily. Thin sand bed, small grain size, abundant cements and under-development primary pore are factors for making acid fluid penetrate into the reservoir difficultly. So the dissolution in the reservoir is slow and weak. Diagenesis is the key factor for genesis of the low-permeability reservoir. Meaning-intensive compaction and cementation make the primary pore and pore-throat narrower, the porosity and permeability lower, and the sandstone tighter. The dissolution is not so thorough as not to improve the porosity and permeability of the reservoir obviously. So it is also an important factor for forming low-permeability reservoir.
Key words:  Pucheng Oilfield  low-permeability reservoir  reservoir characteristics  sedimentation  diagenesis