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Quantitative prediction method of feldspar dissolution and porosity increase
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A prediction method and dissolution technology, applied in the field of oil and gas exploration and development, can solve problems such as one-sidedness, single prediction method, and inability to carry out comprehensive quantitative prediction
Active Publication Date: 2019-06-07
YANGTZE UNIVERSITY
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[0004] At present, in the process of feldspar dissolution research, the existing methods only consider the influence of unilateral factors of feldspar dissolution, such as building a model from a single aspect of temperature, solution pH value or sedimentation rate, but the dissolution is affected by many factors. Factors, cross-effects of various mineral species make the existing prediction methods single and one-sided, and cannot carry out comprehensive quantitative prediction
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Embodiment 1
[0083] The quantitative prediction method of feldspar dissolution and porosity increase comprises the following steps:
[0084] 1) Analyze the geological situation of the study area
[0085] Including regional geological background, basin type, structural features, background content of related strata
[0086] 2) Establish a diagenetic stage prediction model
[0087] (1) Determine the evolution period
[0088] According to the development of the overlying strata of the target layer, the evolution stages of the target layer in the geological history period are divided. The overlying stratum of the target layer L has i layers, which are marked from top to bottom: L1, L2, L3...Li-1 , Li, then there are a total of i target layers in the evolution stages of the geological history period, according to the time evolution, the evolution stages of the target layer L are successively counted as Li, Li-1, Li-2...L2, L1;
[0089] (2) Determine the buried depth of different phases
[0...
Embodiment 2
[0135] Based on the above method, the quantitative prediction of feldspar dissolution and porosity increase in the second member of Dongying Formation in Bozhong sag is carried out. The specific method steps are as follows:
[0136] 1) Analyze the geological situation of the study area
[0137] Taking the second member of the Dongying Formation in the Bozhong Sag as an example, the structural contour maps of the second member of the Dongying Formation at each evolution stage were collected ( figure 1 , figure 2 , image 3 , Figure 4 ), fluid distribution map ( Figure 5 , Image 6 , Figure 7 ),Geothermal( Figure 8 , Figure 9 , Figure 10 ) to determine the diagenetic stage
[0138] 2) Determine the diagenetic stage
[0139] (1) Determine the evolution period
[0140] The overlying strata of the second member of the Dongying Formation are Pingyuan Formation, Minghuazhen Formation, and Guantao Formation from top to bottom, which are marked as L1, L2, and L3 from ...
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Abstract
The invention discloses a quantitative prediction method for the amount of feldspardissolution and increased pores. This method considers the degree of influence of dissolution on feldspar during the pore increase process. It establishes a The temperature model and depth model of feldspardissolution, combined with the structural depth, diagenetic stage, fluid environment of the study area, and the influencing factors of feldspar in the dissolution process, established a model formula from three aspects: feldspar type, pH value, and temperature. Determine the amount of feldspar dissolution and the increase or decrease of secondary pores, and then quantitatively evaluate the amount of increased pores caused by feldspar dissolution in clastic rock reservoirs, providing a basis for pore evolution.
Description
technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a quantitative prediction method for feldspar dissolution and porosity increase. Background technique [0002] With the continuous improvement of energy exploration and development research and modern testing technology, the research on the influence of diagenesis on reservoirs has been paid more and more attention. Dissolution in diagenesis can transform tight sandstone into reservoirs. During the process of dissolution, a large number of secondary pores can be generated, which is one of the most important constructive diagenesis for forming reservoirs. Played an important role in petroleumgeological exploration. my country such as Sichuan Basin, Ordos Basin. Most of the reservoirs to be studied in the Songliao Basin have poor physical properties, mostly low-porosity and low-permeability formations, and the rock types are mostly tight sandstone...
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