Geologic history period sandstone reservoir porosity evolution recovery method

A recovery method and porosity technology, applied in earthwork drilling, suspension and porous material analysis, measuring devices, etc., to achieve the effect of improving accuracy

Active Publication Date: 2012-10-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] The purpose of the present invention is to solve the three problems existing in the restoration method of the porosity evolution of sandstone reservoirs in

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  • Geologic history period sandstone reservoir porosity evolution recovery method
  • Geologic history period sandstone reservoir porosity evolution recovery method
  • Geologic history period sandstone reservoir porosity evolution recovery method

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Embodiment Construction

[0024] The specific technical scheme of the invention is illustrated by the restoration method of porosity evolution of sandstone reservoirs in the geological history period of a certain area of ​​Shengli Oilfield:

[0025] Step 1: Establish the diagenetic evolution sequence of the sandstone reservoir and the corresponding ancient burial depth of the reservoir when diagenesis occurred

[0026] Using techniques such as thin-section observation, scanning electron microscope analysis, and fluid inclusion analysis, combined with the analysis of diagenetic environment evolution, it is believed that the diagenetic evolution sequence of the fourth member of Shahejie Member in a certain area of ​​Shengli Oilfield is: 44.5 Ma-42.5 Ma ago, diagenesis followed by compaction Mainly; 42.5Ma-32Ma ago, compaction / feldspar dissolution / quartz enlargement; 32Ma-24.6Ma ago, compaction / quartz dissolution / carbonate cementation; 24.6Ma- 2Ma ago, compaction / carbonate cement dissolution; 2Ma-present,...

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Abstract

The invention relates to a geologic history period sandstone reservoir porosity evolution recovery method which comprises the following steps: (1) establishing a sandstone reservoir diagenesis evolution sequence and a corresponding paleoburial depth of the reservoir during diagenesis; (2) establishing a normal compaction layout; (3) establishing a functional relationship between porosity and surface porosity; (4) carrying out sandstone reservoir porosity backstripping inversion under the restriction of the diagenesis sequence; (5) correcting by mechanical compaction and hot compaction; and (6) on the basis of the steps above, determining the true porosities of the main diagenetic stages, and establishing the geologic history period sandstone reservoir porosity evolution curve. The invention intensively solves the key problems of the determination of diagenesis occurrence time and paleoburial depth, the relationship between porosity and surface porosity, compaction correction and the like in the existing geologic history period sandstone reservoir porosity evolution recovery method, can effectively predict the porosity of the sandstone reservoir in the oil gas forming period, and provides instructions for effective evaluation on the reservoir.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for restoring porosity evolution of sandstone reservoirs in geological history. Background technique [0002] With the continuous improvement of oil and gas exploration in the middle and shallow layers and the increasing demand for oil and gas reserves, the target of oil and gas exploration has gradually shifted to the deep layer. The potential of deep oil and gas resources in my country is huge, and oil and gas exploration has achieved gratifying results. However, the enrichment law of deep oil and gas is extremely complex, and the reservoirs show complex characteristics such as "sudden oil and water", "storage and dryness", etc., which makes deep oil and gas exploration difficult, high risk, and low success rate. Medium-deep sandstone reservoirs have undergone complex diagenetic transformation during the burial process, and the reser...

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Application Information

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IPC IPC(8): E21B49/00G01N15/08
Inventor 操应长王艳忠宋国奇葸克来王永诗刘惠民陈林马奔奔
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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