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Method for quantitatively predicting cementation porosity decrement of clastic rock reservoir

A prediction method and technology of clastic rocks, applied in the field of oil and gas exploration and development, can solve the problems of difficult cementation and weak cementation strength of clastic rock reservoirs

Active Publication Date: 2018-07-31
YANGTZE UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the diagenetic process, there are more or less cementation types, different cementation times, and stronger or weaker cementation strengths, so it is very difficult to quantitatively predict the amount of cementation in clastic rock reservoirs.

Method used

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  • Method for quantitatively predicting cementation porosity decrement of clastic rock reservoir
  • Method for quantitatively predicting cementation porosity decrement of clastic rock reservoir
  • Method for quantitatively predicting cementation porosity decrement of clastic rock reservoir

Examples

Experimental program
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Effect test

Embodiment 1

[0121] The quantitative prediction method of cementation void loss includes the following steps:

[0122] 1) Collect geological data of the study area, which includes:

[0123] ① The research results of the sedimentary facies of the target layer in the study area;

[0124] ②Contour map of target layer interface structure;

[0125] ③Contour map of the interface structure of the overlying strata of the target layer;

[0126] ④Reservoir physical property data in the study area;

[0127] ⑤Single well diagenesis data in the study area;

[0128] ⑥The diagenetic evolution sequence in the study area;

[0129] ⑦ Burial history and thermal evolution history in the study area;

[0130] 2) Establish a database of original data

[0131] (1) Sedimentary facies type database F_m

[0132] The types of clastic reservoir sedimentary facies are summarized and classified, including: alluvial fan-dry fan-fan root F_1, alluvial fan-dry fan-fan middle F_2, alluvial fan-dry fan-fan margin F_3, alluvial fan- Wet fan...

Embodiment 2

[0214] The quantitative prediction method based on the above-mentioned clastic reservoir cementation and porosity reduction is used to predict the second member of Dongying Formation in Bozhong Sag. The specific steps are as follows:

[0215] 1. Collect geological data of the study area

[0216] Collect the geological data of the second member of Dongying Formation in Bozhong Sag, and classify various types of data according to the original data database. The collected geological data include the following: sedimentary facies map of the second member of Dongying Formation, lithology map of the second member of Dongying Formation, distribution map of the second member of Dongying Formation, pH map of the second member of Dongying Formation, and second member of Dongying Formation. Diagram of the diagenetic stages of the second member of the Dongying Formation and the sedimentary cycle diagram of the second member of the Dongying Formation (as shown in the figure).

[0217] 2. Determi...

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Abstract

The invention discloses a method for quantitatively predicting the cementation porosity decrement of a clastic rock reservoir. The method, by identifying the key geological factors of different geological processes and the differences thereof, and the influences of geological factors in different geological processes on the cementation porosity decrement in the reservoir, constructs a porosity response quantitative equation, simulates the reservoir porosity evolution process according to the quantitative response equation, reproduces the influences of cementation in the diagenetic process of the sediment reservoir on the reservoir physical property change law, and can well quantitatively predict the cementation porosity decrement of the clastic rock, so as to provide new ideas and basis for the study of reservoir physical properties in the basin.

Description

Technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for quantitatively predicting the cementation pore reduction of clastic rock reservoirs. Background technique [0002] During the process of sediment burial and diagenesis, the volume and pore space of the rock gradually shrink, and the rock becomes more and more dense. The compaction is the main controlling factor for the reservoir performance of sandstone. Most of the total pore loss of the layer is more than that, which greatly affects the reservoir properties of the sand body. [0003] Cementation is a change of sediments in the diagenesis process. During this process, crystals precipitated from the pore solution can bind loose particles together and consolidate the diagenesis. Common cements are argillaceous, iron, siliceous and calcareous. In the evolution of the reservoir, cementation is one of the main reasons for the reduction of prima...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 钱文蹈尹太举张昌民侯国伟何苗马嘉令赵晓悦杨兰蒋蕾唐慧佳
Owner YANGTZE UNIVERSITY
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