4 results about "Pressure solution" patented technology

The application discloses a method for identifying lithofacies of carbonate rocks, and particularly relates to the technical field of rock analysis, and comprises the following steps: S1, digital processing of rock slices; S2, analysis of diagenetic sequence characteristics; S3, spatial modeling of lithofacies characteristics; S4, optimization of dynamic determination rules; and S5, attribution of carbonate rock lithofacies. According to the method, backscattering images are collected and subjected to digital processing, the geometric morphology of rock fabric and the element ratio of cements are uniformly quantified, and multiple diagenetic indicators such as pressure solution suture line curvature and top-bottom structure frequency are fused to construct a multi-dimensional characteristic space defined by sedimentary fabric and diagenetic modification. According to the distribution of special phenomena such as bird eye structure, the weight of key parameters and the determination critical value can be dynamically adjusted, and finally, the automatic attribution of lithofacies is realized, and the objectivity and accuracy of the identification of complex carbonate rock lithofacies are effectively improved.

The present invention discloses a method and system for determining fracture and cave parameters in a multi-branched fault-karst reservoir. The method comprises: obtaining measured data of the bottomhole pressure of a test well after shut-in, which changes over time; determining the initial parameters of a pre-constructed mathematical model of the bottomhole pressure of a multi-branched fault-karst combined production reservoir based on the basic geological data of the fracture and cave in the multi-branched fault-karst reservoir, using the initial parameters as the initial values of the fitting parameters, and solving to obtain the bottomhole pressure solution of the multi-branched fault-karst combined production reservoir; calculating the difference between the pressure of the measured data and the pressure solution obtained; if the difference is less than a preset fitting error, using the initial parameters as the final fitting parameters; if the difference is greater than or equal to the preset fitting error, correcting the fitting parameters until the difference is less than the preset fitting error, and obtaining the final fitting parameters. The present invention can determine the spatial distribution of fractures and caves in a multi-branched fault-karst reservoir by only acquiring pressure data once.

The invention relates to a method for analyzing influence factors of compaction and pressure-solution action strength in carbonate rock, which comprises the following steps of: S1, counting rock cores obtained by drilling a carbonate rock reservoir, and recording the number and the form of suture lines, the thickness of insoluble residues and the accumulative amplitude of each rock core; s2, samples are selected from the rock core obtained in the step S1 and the field rock outcrop of the same target layer, and each sample is prepared into a common rock slice and a casting body slice impregnated with blue epoxy resin; s3, counting the number and accumulated amplitude of suture lines in the rock slice; s4, determining component content data of different lithologic slices; s5, performing micro-area X-ray diffraction analysis on the rock powder, and measuring mineral components and proportions in different lithologic samples; and S6, integrating the data counted in the steps S1, S3, S4 and S5, and analyzing the trend of the influence of the data on the compaction strength and the crush-solution strength in the carbonate rocks.

The application discloses a kind of radial multi-hole composite oil reservoir cave calculation method, system, equipment and medium, S1, fracture-cave carbonate rock oil and gas reservoir is divided into two parts, one part is cave and matrix, another part is the region where fracture is, fracture-cave carbonate rock multi-hole oil and gas reservoir is simplified as single-hole composite oil and gas reservoir;S2, the dimensionless pressure solution of well bottom of single-hole composite oil and gas reservoir is calculated;S3, the derivative curve of well bottom dimensionless pressure solution is obtained, and the derivative curve of well bottom dimensionless pressure is fitted measured well bottom pressure and its derivative curve, when two double logarithmic curves coincide, the simplified cave radius is inverted, to obtain cave volume.Can accurately calculate the cave volume when cave is individually distributed in stratum.