42 results about "Stratigraphy" patented technology

The present invention relates to a method for updating a stratigraphic model according to measurements performed in a basin. The method comprises steps of: i) determining at least a first spatial distribution of the values of an attribute representative of the basin stratigraphy, and applying a classification method for converting the first spatial distribution to a first classified image; ii) performing a stratigraphic simulation with first parameter values of the simulation, deducing therefrom a second spatial distribution of the values of the attribute and applying the same classification method identically to determine a second classified image; iii) determining a distribution of local dissimilarities between the first and second classified images, and modifying the values of at least one of the stratigraphic simulation parameters to minimize an objective function formed from at least the local dissimilarity distribution; and iv) updating the stratigraphic model by performing at least one stratigraphic simulation with the modified simulation parameter values.

The invention discloses a method for depicting the relationship between horizontal well track and strata, comprising the following steps: (1) acquiring the position information of a horizontal well on an oil and gas reservoir structure to get a geological data body of an area where the horizontal well is located; (2) standardizing the well logging curve of vertical wells and pilot hole wells in the area where the horizontal well is located; (3) performing stratigraphic comparison to determine the top and bottom limits of a drilling target stratum of the horizontal well, and building a target stratum top and bottom structure model; (4) selecting a vertical well adjacent to the horizontal well, and conducting multi-well fine sand body comparison to form a sand body fence diagram; (5) building a 3D sand body model; (6) collecting sand body slices along the horizontal well track in the 3D sand body model to get an initial model of the relationship between horizontal well track and strata; and (7) correcting sand body slices around the horizontal well track to realize visual representation and fine depiction of the relationship between horizontal well track and strata. By using the method, fine depiction of the relationship between horizontal well track and strata is realized.

The invention discloses a stratigraphic correlation method and a system for a petroliferous basin. The method comprises the steps of dividing a petroliferous basin into a plurality of deposition systems; conducting the stratigraphic correlation successively for each deposition system based on the isolithology correlation method, and also conducting the stratigraphic correlation for the deposition system based on the isochronous correlation method so as to obtain an isochronous-sequence stratigraphic framework of the deposition system; based on the isochronous-sequence stratigraphic frameworks of all the deposition systems, obtaining a comprehensive-sequence stratigraphic framework. According to the invention, the novel stratigraphic correlation technique with each deposition system as a unit is adopted. Different stratigraphic correlation methods are adopted for the same deposition system in the basin and different deposition systems in the basin. Meanwhile, the isolithology correlation of the traditional stratigraphy and the isochronous correlation of the sequence stratigraphy are combined for comprehensive analysis. Therefore, the stratigraphic correlation problem in the same deposition system and the stratigraphic correlation problem among different deposition systems can be effectively solved. As a result, exploration errors caused by stratigraphic correlation faults can be avoided.

The invention discloses a method for judging the age of petroleum source rocks by comparing evaporite and petroleum sulfur isotopes, comprising the following steps: S101, collecting sulfate samples in evaporite strata and performing sulfur isotope analysis to obtain the sulfur isotope of evaporite strata Data; S102. Collect carbon isotope samples in carbonate strata interbedded with evaporite strata and conduct carbon and oxygen isotope analysis, and then conduct carbon isotope stratigraphic studies to determine the geological age of evaporites; S103. Based on evaporation Sulfur isotope data of rock formations and the geological age of evaporite rocks to improve the international sulfur isotope curve; S104. Analyze sulfur isotope in oil and obtain sulfur isotope data of oil; S105. Combine sulfur isotope data of oil with sulfur isotope data of evaporite formations For comparison, and combined with the international sulfur isotope curve to determine the geological age of petroleum source rocks.