Stratum data processing method for identifying stratum attribute
A technology of formation data and formation properties, applied in the field of geophysical exploration and development, can solve problems such as changes, influences on resistivity, fracture porosity, interpretation of reservoir division, and trouble logging engineers and reservoir engineers
Inactive Publication Date: 2012-08-01
康志勇
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[0003] Bedrock is produced in the form of metamorphic rock, carbonate rock, and intrusive rock, and is a complex geological body composed of double-porous medium rock layers. Especially in recent years, explorers have continuously discovered large-scale fractured oil and gas in deep rocks. However, there are still many problems in the understanding of fractured reservoirs, such as fracture porosity interpretation and reservoir division, which have been bothering logging engineers and reservoir engineers.
Existing studies have shown that fracture porosity is only related to deep and shallow lateral resistivity, drilling fluid or mud filtrate resistivity, and macroscopic fracture cementation index, but there is a big gap between this and the actual formation conditions, such as: whether the movable fluid in the fracture is All of them are displaced by drilling fluid or mud filtrate, which will directly affect the change of resistivity; the proportion of drilling fluid and mud filtrate in fractures in the invasion fluid is different, and the resistivity will be different; matrix pores directly connected with macroscopic fractures When some mud filtrate invades, it will also affect the change of reservoir resistivity; the influence of the change of bound water saturation of matrix rock blocks and macroscopic fractures on resistivity cannot be ignored
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[0226] Well Shen 630: Drilling fluid density 1.03g / cm 3 , the resistivity of the drilling fluid at 16°C is 0.78Ω·m, and the buried depth of the target layer (Archean metamorphic rock) is 3515m, so the resistivity of the mud filtrate under the formation conditions is calculated to be 0.424Ω·m; degree of 0.80; the original oil saturation of fractures calculated according to the fracture openings of actual core statistics is 0.99; The formation fluid replacement rate is 4.76%; within the detection range of deep lateral resistivity logging, the formation fluid replacement rate in bedrock fracture pores is 9.8%, and the formation fluid replacement rate in bedrock matrix pores is 0.2%; The distribution coefficient of mud filtrate within the detection range of rate logging is 0.95; the distribution coefficient of mud filtrate within the detection range of deep lateral resistivity logging is 1.0; The value is 350Ω·m; the porosity of the bedrock matrix calculated by the acoustic time ...
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The invention provides a stratum data processing method for identifying stratum attribute, which is applicable to bedrock fracture porosity calculation for identifying the bedrock stratum attribute. The method includes the following steps: utilizing geographical exploration and development equipment to collect bedrock stratum data, obtaining the basic parameters required by the bedrock fracture porosity calculation by analyzing the collected bedrock stratum data through analyzing equipment, and establishing the equation of the fracture porosity of the pure water layer, the movable water containing oil layer and the pure oil layer of the bedrock stratum before and after being contaminated by the drilling fluid by deducing the equation of the deep and shallow lateral resistivity of the bedrock stratum before and after being contaminated. The stratum data processing method utilizes the deep and shallow lateral resistivity well logging to explain the bedrock fracture porosity, so as to further improve the credibility of the bedrock oil deposit resource evaluation.
Description
technical field [0001] The invention relates to a method for geophysical exploration and development, specifically a formation data processing method for calculating bedrock fracture porosity by using formation resistivity, belonging to the comprehensive evaluation category of rock formation information in geological exploration and development, especially applying resistivity logging data to calculate macroscopic fracture pores degree, and then identify the stratigraphic data processing method of stratigraphic attributes. Background technique [0002] Macroscopic fractures are an important part of dual-porous media, which are composed of macroscopic fracture systems and matrix rock block systems cut by them. The dual-porous medium is composed of two types of storage spaces: one is macroscopic fractures and intersecting large pores, and the other is microfractures and micropores and microvoids. Typically, macroscopically fractured systems have much greater permeability and ...
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Inventor 康志勇闫家宁刘兴周李若懿周明旺李晓涛张博勇
Owner 康志勇