Abstract
Hongqi sag is located in the north of Beiehur depression in Hailar Basin, which is a secondary structural unit in the peripheral depression of Hailar Basin, with great exploration potential. Based on SEM, conventional thin sheet, cast thin sheet, mercury pressure and physical property data, this paper discusses the reservoir characteristics, types and control factors of high quality reservoir in Tongbomiao formation, Hongqi sag, so as to provide a strong geological basis for the exploration of oil and gas in this area. The reservoir space of Hongqi sag is mainly composed of four types: primary intergranular pore, micro fracture, feldspar dissolution pore and debris dissolution pore. It is of the type of ultra low porosity and low permeability. Although Tongbomiao formation in Hongqi sag is of very low porosity and low permeability type, high quality reservoir is still developed, and its reason is mainly controlled by sedimentary environment, diagenesis and structural fracture.
Highlights
The characteristics and formation mechanism of clastic rocks in continental fault depression basin have been a hot issue, and many scholars have done more work in these aspects
Tongbomiao formation in Hongqi sag is an ultra-low porosity and low permeability reservoir, high quality reservoir is still developed, which is mainly controlled by sedimentary environment, diagenesis and structural fractures
The reservoir of Tongbomiao formation in Hongqi sag is affected by compaction and diagenesis, and the loss of primary pores is large
Summary
The characteristics and formation mechanism of clastic rocks in continental fault depression basin have been a hot issue, and many scholars have done more work in these aspects. Hongqi sag has experienced multistage structural transformation and superimposed fault depression, and the influencing factors of reservoir physical properties are complex and diverse, and the distribution law is not clear. With the development of exploration, the physical properties of clastic rock reservoir are the important factors to control oil and gas. There are still some controversies about the main factors of high quality reservoirs in cupbimiao formation in Hongqi sag. Based on SEM, conventional thin sheet, cast thin sheet, mercury pressure and physical data, this study advances the reservoir characteristics and main control factors of cupbimiao formation in Hongqi sag The detailed analysis provides a strong geological basis for the exploration of oil and gas in the area
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