47 results about "Sequence stratigraphy" patented technology

The invention relates to the field of geological exploration, in particular to a method for dividing stratum structures of a mining area. The method comprises the following steps of drilling multiple wells in the mining area, extracting a core sample from each well and acquiring a logging curve; dividing the mining area into multiple subareas according to a geological structure and depositional setting; analyzing the extracted core samples and the logging curve according to sequence cycle standard in a sequence stratigraphy principle, classifying the stratum structures of the wells from which the core samples are extracted, and determining a marker bed and a boundary mark among the marker beds; determining a standard well in each subarea, and adopting the stratum structure of the standard well in each subarea as the stratum structure of the subarea; unifying the stratum structures of all standard wells; and integrating the stratum structure of each subarea, and establishing a stratum structure layout chart of the entire mining area. The core samples are analyzed by utilizing the sequence cycle standard, so that the stratum structures are more reasonable to divide, and the diachronous phenomenon is avoided.

The invention relates to the field of oil and gas field exploration and development and geomechanics, and especially relates to a heterogeneous reservoir geology-mechanics modeling method based on a finite element method. According to the invention, small layer contrast, sedimentary microfacies dividing and sequence stratigraphy principles are comprehensively used to identify a lithologic gradient-abrupt change interface; seismic data inversion mechanical parameters are combined, and the result of a triaxial mechanical experiment and logging interpretation is used as constraint to realize heterogeneous reservoir geology-mechanics modeling based on the finite element method; based on actual geological data, the method digitizes corresponding geological information, and uses a computer programming language to develop a corresponding calculation program; finite element simulation software is used to realize heterogeneous reservoir geology-mechanics modeling; the method has a high practical value for heterogeneous reservoir geology-mechanics modeling, and has the advantages of low modeling cost and high operability; and the accuracy of geology-mechanics modeling can be greatly improved.

The invention provides a map series and technical method for construction of a continental sequence stratigraphic framework. The method includes the specific steps that in the aspect of 'points', drilling data is given priority to, and a single-well analysis map series and a mapping method are determined; in the aspect of 'lines', based on a connecting-well profile and a seismic profile, a map series and mapping method of the 'lines' are determined; based on research results of 'points and lines', according to a plane figure, a map series of 'surfaces' is determined; by means of a three-dimensional data body, through the combination with sequence stratigraphic 'body' research, a map series and mapping method of the 'body' are determined; by means of time data, based on the spatio-temporal evolution of sequence stratigraphy, a map series and technical method of the sequence stratigraphic 'body' are determined, and finally a sequence stratigraphic framework drawing is formed. By means of the method, mapping is started, a standard industrial drawing is formed, the map series and technical method can be directly used for guiding oil and gas exploration, the application effect of research results is improved, exploration risks are avoided, and exploration costs are reduced.

The invention provides a method and device for determining a sedimentary stratum ancient landform. The method comprises the steps that objective horizon obtained in advance is divided according to the third-order sequence division mode in the sequence stratigraphy theory, and a sequence stratigraphic framework of the objective horizon is built to determine the studying sequence; the horizon, in accordance with the preset requirements, in the studying sequence is selected as restoring horizon; the thickness of the restoring horizon is obtained according to the top boundary and the bottom boundary of the restoring horizon; decompaction treatment is performed on the thickness of the restoring horizon to determine the original sedimentary thickness; the sedimentary stratum ancient landform is determined according to the mirror-image relationship between the original sedimentary thickness and the ancient landform. According to the method and device for determining the sedimentary stratum ancient landform, the condition that a denudation phenomenon may exist in the objective horizon is considered, the sequence stratigraphic division is performed on the objective horizon, a selection method of the restoring horizon is discussed under the constraint of the sequence stratigraphy theory to obtain the accurate stratum thickness used for ancient landform restoring, and therefore the accuracy of ancient landform restoring is improved.

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 seismic geology identification method of a coal-bed gas dessert zone based on a seal-up unit and a rough set. According to characteristics of composition factors of the seal-up unit, pre-stack / post-stack seismic data is used to implement integrated seismic geology interpretation of coal system stratum construction, lithology and rock elasticity and physical parameters aswell as integrated analysis on sequence stratigraphy, seismic stratigraphy, seismic sedimentology and coal-bed gas geology; different information complement one another; and a rough set identificationtheory is used to discriminate the composition factors in an integrated way, and a coal-bed gas desert zone is identified. Research on change characteristics of the coal bed itself are converted intoresearch on construction, deposition and lithology change which has effect on coal-bed gas migration in vertical and horizontal directions of the coal system, the rough set is introduced into an extended identification method, the identification process is less relied on experience, interference of artificial factors is avoided, the coal-bed gas dessert zone is identified more reliably, and the practical application value is high.