34 results about "Provenance" patented technology

The invention discloses a method for analyzing sand bodies in reservoirs based on an inversion technique of the sedimentary dynamics under the condition of sparse wells. The method is characterized in that through building a sand-body inversion model of sedimentary dynamics based on a principle of three-dimensional sedimentary transport geology and considering the control action of fluid velocity on sedimentary evolution and the reconstructive function of tectonic movements, the analysis on the distribution evolution of sand bodies in complex sedimentary basins under the condition of sparse wells can be realized. The method is implemented through the following steps: re-simulating the relationship between the three-dimensional attribute distribution data of a single sand layer of a reservoir and the time variation; carrying out variance making on the pre-simulated results and the results obtained by simulating well-point data as well as well logging interpretation and bore-hole data of the reservoir; according to the concept of a negative gradient search algorithm, modifying the terrain, flow field and source distribution of the reservoir; and operating the steps until the accuracy conditions of reservoir modeling are satisfied. The method disclosed by the invention provides a basis for the development of analysis on sand bodies in basin reservoirs under the condition of sparse wells, and is especially suitable for being applied to the research on sand bodies in sea basins with less drill holes.

The invention discloses an ultra-low permeability reservoir dominant seepage channel identifying and characterizing method. The method comprises the following steps of firstly, determining the material source direction of an oil production interval, the ancient riverway orientation, a sand body internal building structure and a single sand body rhythm type; determining micro-fracture parameters ofthe production interval, and constructing a three-dimensional fine geological model of a to-be-researched block; establishing a reservoir prediction model in the current development stage; establishing a four-dimensional reservoir underground streamline evolution model of the to-be-researched block, quantitatively evaluating the injection-production well communication relationship and the injection-production corresponding rate, and comprehensively identifying the position and the plane orientation of the dominant seepage channel between well groups; and quantitatively calculating the advancing speed of the water flooding front edge, the tracer agent interpretation swept volume, the tracer agent interpretation permeability and the Lorentz coefficient, screening static indexes and dynamicindexes capable of characterizing the strength of the seepage channel, and establishing an evaluation index system and defining parameters of the ultra-low permeability reservoir dominant seepage channel. According to the method, quantitative research on the three-dimensional space distribution rule of the channel provides guarantee for effective treatment of the extra/ultra-low permeability reservoir dominant seepage channel and improvement of the final recovery ratio of crude oil.

The invention belongs to the technical field of uranium ore mineralization potential evaluation, and particularly discloses an evaluation method suitable for judging a sandstone type uranium ore uranium source in a basin. The evaluation method comprises the steps of: (1) collecting an ore-containing target layer sandstone sample; (2) selecting chippings zircon in the sample to prepare a zircon target; (3) testing the U-Pb isotope and U element content of zircon; (4) acquiring a zircon isotopic age histogram and a zircon U-Pb isotopic age and U content element diagram according to the U-Pb isotope and the U element content; (5) providing a source magmatic rock age range and geographical distribution characteristics for the ore-bearing target stratum sandstone according to the analysis in the step (4); (6) finding out the age range of the detritus zircon with the highest U content and particle number ratio according to the U-Pb isotopic age of the zircon and the U content element diagram, and determining a uranium source in a pre-enrichment stage in combination with the step (5); and (7) determining a uranium source in the mineralization stage according to the steps (5) and (6). Theevaluation method provided by the invention can be used for judging uranium sources in sedimentary diagenetic and mineralization action stages of the ore-bearing target layer.

The invention discloses a method for determining a lithogenous phase boundary point of a carbonate reservoir stratum. In the method, with six geological parameters of sedimentary facies, provenance, apH value, sedimentary cycle, diagenetic stages and fault indexes being lithogenous phase type boundary binding conditions of the carbonate reservoir stratum, in combination with mine lithogenous phase data, lithogenous phase transverse distribution is predicted, and the defects in work of research on lithogenous phase transverse prediction in the prior art are overcome. The method determines theeffectiveness of the stratum, and provides bases for reservoir evaluation.

The invention provides a set of technical method for systematically and comprehensively identifying a basin edge deposition fan body in a deep water area of a South China Sea oil-gas-containing basin.The invention relates to a method for quantitatively identifying a sedimentary fan body at the basin edge of a sedimentary basin by comprehensively analyzing six kinds of data such as same sedimentary faults, landforms, object sources, seismic facies, seismic attributes and a sedimentary center. The method is particularly suitable for deep water areas of oil-gas-bearing basins in the South ChinaSea. According to the method, on the basis of inheriting a former person recognition method, a tectonic sedimentology theory and a seismic sedimentology theory are combined, multi-method, multi-angleand five-in-one cooperation is adopted to recognize and judge the development of the basin edge sedimentary fan body, finally quantitative research is achieved, and the accuracy and credibility of a recognition result are greatly improved; meanwhile, different identifications in each identification method are assigned, the final total score is calculated, whether the fan body develops or not is quantitatively described, and the method is convenient and operable.

The invention provides a method and device for determining lithology of clastic garnet mineral mother rock. The method comprises steps of preliminarily determining the lithology of the clastic garnetmineral mother rock through employing a garnet Mg-Fe+Mn-Ca main element discrimination graph according to a main element analysis result of a to-be-detected clastic garnet mineral; and when the main element analysis result of the to-be-detected chip garnet mineral falls in the Type A, Type B or Type D region of the discrimination graph, further determining the parent rock lithology of the to-be-detected chip garnet mineral by utilizing the trace element analysis result of the to-be-detected chip garnet mineral. According to the method, garnets from a basic rock source and a variable basic rocksource can be more systematically and accurately distinguished, garnets from different types of skarn sources can be distinguished, and garnets from a granite source, a high-grade granite phase-change argillaceous rock source and a medium-low-grade hornstone phase-change argillaceous rock source can be distinguished; and therefore, the method plays an important role in the aspects of material source recovery research, even basin-mountain coupling relationship research and the like.

The invention discloses a source-sink system quantitative evaluation method, and belongs to the field of sediment source analysis. The method comprises: constructing a conceptual model based on geological data; determining simulation parameters under the guidance of the conceptual model, and establishing a sedimentary stratum quantitative model through stratum forward modeling based on the hydrodynamic principle; based on the principle of conservation of substances, combining with real geological data to verify that the sedimentary model is reasonable, and extracting sedimentary thicknesses from different material sources in different time steps by using the model after the material source input mode is changed; and calculating and processing the thickness of the sediments from different material sources in the simulation time step length, and analyzing the contribution of the sediments from different material sources. The method solves the problems that an existing method cannot carry out work in areas without wells or with few wells, and sediments from different material sources in the basin cannot be quantitatively distinguished. In consideration of internal and external dynamic geological effects such as reference surface lifting and structural activity, the method has the characteristic of quantitatively evaluating the relative contribution of sediments from different mother rock areas in the basin in different time steps in the source-sink system.

The invention provides a method and device for calculating the denudation rate of a source region of a sedimentary basin. The method comprises the steps: carrying out macroscopic sedimentation background analysis of a target layer according to seismic data of the target layer, and determining plane positions of a source region, a carrying region and a convergence region of sediments in a sedimentation period of the target layer; carrying out statistics to obtain the plane area and the number of sedimentary bodies in the convergence region; carrying out statistics to obtain the average thickness of the sedimentary body in the convergence region; carrying out statistics to obtain the number of channels in the carrying region, the sectional area of the carrying channel and the extension length of the carrying channel; determining the denudation area of the source region and the denudation duration of the target layer; and calculating the denudation rate of the sedimentary basin source region. According to the method, the denudation rate of the sediment source region is accurately calculated, the denudation rate of the sediment basin source region is quantitatively represented, and theimprovement of the accuracy of paleo-geomorphic recovery and paleo-climatic condition recovery in the deposition period of the target layer is facilitated.

The invention discloses a lake basin material source and sand body migration direction identification method and device. The identification method comprises the following steps of: establishing a small-layer or single-layer comparison grillwork of a target interval of a research area; dividing sandstone of the target interval of the research area into good sandstone and poor sandstone by utilizinga natural gamma curve; drawing a good sandstone contour map and a sand-land ratio contour map of the target interval of the research area by utilizing the thickness data of the good sandstone; and utilizing the thickness contour map of good sandstone and the sand-land ratio contour map to analyze the material source of the lake basin and the migration direction of the sand body. According to themethod, the false phenomena that the whole basin contains sand and the material sources are connected due to longitudinal superposition of the sand bodies without distinguishing the sand bodies in thepast are eliminated, so that the identification of the material sources and the migration direction of the sand bodies is more intuitive and precise, and more information is reflected.

The invention relates to a sedimentary facies identification method, device and system, and belongs to the technical field of oil-gas field development geology. The identification method comprises the following steps: carrying out ancient landform recovery on a research area to obtain an ancient landform map after deposition of the research area; converting the ancient landform map into a vector structure map; selecting a calculation section on the vector structure map along the object source direction; selecting a plurality of deposition points on the calculation profile, including the highest deposition point; obtaining gradient and horizontal displacement of each deposition point relative to the highest deposition point according to the coordinates of each deposition point; performing staged fitting on the gradient and the horizontal displacement of each deposition point relative to the highest deposition point, finding out inflection points between stages, and taking a gradient value at the inflection points as a critical gradient value; and identifying each sedimentary facies according to the critical gradient value. According to the method, the accuracy of sedimentary facies identification is improved, the boundaries between the sedimentary facies can be quantitatively found out through the critical gradient values, and the sedimentary facies region is accurately divided.

The invention discloses a clastic rock reservoir grading evaluation method, and relates to the technical field of reservoir grading evaluation. The problem that a unified reservoir grading evaluation standard does not exist is solved. The clastic rock reservoir grading evaluation method comprises the following steps that each specific parameter for controlling the reservoir quality is summarized and concluded into four factors, namely a material source factor, a deposition factor, a diagenesis factor and a formation pressure factor; and then grading evaluation is carried out on the reservoir in a research area based on the material source factor, the deposition factor, the diagenesis factor and the formation pressure factor. The reservoir quality control parameters can be comprehensively reflected, reservoir grading evaluation standards can be unified, the unified reservoir grading evaluation standards are adopted to perform grading evaluation on reservoirs, and the clastic rock reservoir grading evaluation method can be applied to exploration and development work of petroliferous basins. The clastic rock reservoir grading evaluation method is used for performing clastic rock reservoir grading evaluation.