东营凹陷沙河街组近岸水下扇低渗储层成因

doi:10.11743/ogg20140509

Abstract

Abstract:

In order to demonstrate the genesis of low permeability reservoir of nearshore subaqueous fan in northern steep slope of Dongying sag,abundant cores and reservoir analysis data were utilized to conduct the research on lithological characters of reservoir,diagensis,diagenetic sequence and porosity evolution as well as their controlling factors.The sandbodies of nearshore subaqueous fan of the Shahejie Formation consist of arkose and feldspathic lithic sandstone and the reservoirs have experienced strong compaction,carbonate cementation,dissolution of calcite and feldspar in the burial diagenetic evolution.The reservoirs are at the middle diagenetic stage now,have a burial depth in the range of 1 700-3 500 m and mid-low porosity(mean porosity 11.3%)and low permeability(mean permeability 23.12×10^-3 μm²).The strong compaction and carbonate cementation reduced the porosity and permeability of the reservois,while dissolution contributed to the improvement of reservoir quality.The intergranular pores and intragranular pores resulted from dissolution of calcite and feldspar at the depth of 2 900-3 200 m are constructive to reservoir quality(porosity up to 25% and permeability up to 1 000×10^-3 μm²).Obviously,identification of dissolution and intervals with well-developed secondary pores is extremely important for predicting favorable reservoir.

Key words: diagenesis, nearshore subaqueous fan, favorable reservoir, low permeability reservoir, Shahejie Formation, Dongying Sag, Bohai Bay Basin

CLC Number:

TE122.2

Zhu Xiaomin, Wu Dong, Zhang Xin, Wang Xingxing, Han Xuefang, Zhang Shoupeng. Genesis of low permeability reservoirs of nearshore subaqueous fan in Shahejie Formation in Dongying Sag, Bohai Bay Basin[J]. Oil & Gas Geology, 2014, 35(5): 646-653.

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Genesis of low permeability reservoirs of nearshore subaqueous fan in Shahejie Formation in Dongying Sag, Bohai Bay Basin

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