6 results about "Sedimentary depositional environment" patented technology

The invention discloses a high-precision recovery marine facies compact limestone sedimentary environment and oil-gas dessert area prediction method. The method comprises the steps that S1, an argillaceous limestone phase, an argillaceous limestone phase, a mud-powder crystal limestone phase and a paste limestone phase are divided through X-ray diffraction and slice identification; s2, utilizing a chemical weathering index CIA, a Sr / Ca salinity index and delta 13Corg organic carbon isotope to synergistically recover paleo-climate and paleo-hydrological conditions; s3, combining total organic carbon TOC, organic matter maturity Ro, terrestrial input Al and Ti content and nanopore development degree, and establishing an organic matter-rich high-quality lithofacies evaluation standard; and S4, according to an evaluation standard, well drilling, well logging and seismic data are fused to predict the oil and gas sweet spot area. Through the four steps of lithofacies division, paleoenvironment recovery, evaluation standard establishment and dessert area prediction, high-precision recovery of the marine facies compact limestone sedimentary environment is realized, the dessert area prediction success rate is improved to 78%, and efficient technical support is provided for oil-gas exploration.

The application discloses a kind of geologic history period microbial dolomite deposition mechanism quantitative simulation calculation method, which comprises the following steps: accurately assess whether the signal of original depositional environment of sample is preserved during deposition period, calculate the concentration of pH value, total alkalinity, calcium ion and magnesium ion of paleoseawater during deposition period, reconstruct the attribute parameter of paleoseawater in geologic history period, quantitatively analyze the different influence of the difference of physical and chemical conditions of paleoseawater on the deposition process of microbial dolomite, simulate and calculate the microbial dolomite genesis mechanism and process in geologic history period.The application quantitatively and comprehensively studies the microbial dolomite genesis mechanism, and can provide new ideas for the genesis of similar dolomite in geologic history period and the comprehensive solution of the old mystery "dolomite problem".

The application discloses a method and device for identifying an evaporite sedimentary environment, and the method comprises the following steps: determining a sedimentary sub-environment of a single well in a study area according to core data and geochemical analysis data of the single well; establishing an environment identification chart according to the determined sedimentary sub-environment, a trace element uranium value in the geochemical analysis data and a logging curve gamma value; and determining an evaporite sedimentary environment of a single well to be identified in the study area according to a logging curve uranium value and a logging curve gamma value of the single well to be identified, and combining the environment identification chart.

A method can include, responsive to receipt of a search instruction that includes one or more search criteria, accessing a data structure for subsurface geologic regions categorized at least in part according to parameters that describe depositional environments, where the data structure includes one or more includes virtual distances between the parameters; generating a search result using the one or more search criteria and the data structure, where the search result represents an organization of at least a portion of subsurface geologic regions as closest analogues to the one or more search criteria; and transmitting search result information for graphically rendering the search result to a display as part of an interactive graphical user interface.

The application provides a method for determining the genesis and sedimentary environment of siliceous rocks by using multi-index comprehensive analysis, relates to the technical field of geological exploration and geochemistry, and comprises the following steps: pretreating a siliceous rock sample to obtain a to-be-tested powder sample; testing the to-be-tested powder sample to obtain the content of corresponding elements; calculating and obtaining a genesis parameter for characterizing the genesis type of the siliceous rock, and then obtaining a genesis type determination result; calculating and obtaining an environment parameter for characterizing the sedimentary environment of the siliceous rock, and then obtaining a sedimentary environment determination result; and comprehensively analyzing and cross-verifying the determination results to form a final discrimination conclusion. The application can effectively distinguish hot water deposition, biological genesis and composite genesis siliceous rocks by comprehensively analyzing multiple indexes such as major elements, trace elements and rare earth elements, and combining multiple graphic cross-verifications, obviously reduces the multi-solution and subjectivity of traditional single-index discrimination, and accurately determines the sedimentary environment such as continental margin and ocean basin through element ratio and graphic analysis.

The invention discloses a subterranean area tidal plateau facies mixed rock sedimentary cycle division method, and relates to the technical field of geophysical exploration. Comprising the following steps: carrying out microscopic feature observation under a mirror on a coring section of the shallow water tide plateau phase mixed rock so as to obtain the content of characterization minerals of the coring section; performing linear fitting on the content of the characterization mineral substance of the coring section and a GR logging curve, and establishing a logging curve and mineral content conversion model; on the basis of the logging curve and mineral content conversion model and the GR logging curve value, the non-cored well section is calibrated to represent the mineral content, so that a vertical change curve representing the mineral content of the whole target interval is established; determining the deposition environment according to the characterization mineral content; and based on the change of the depth of the water body reflected by the sedimentary environment recovery, dividing the sedimentary cycle of the tidal plateau phase mixed rock. According to the method, under the condition that part of wells are not cored, the tidal plateau phase mixed rock in the subterranean area can be divided, and the method plays an important role in guiding exploration and development of a research area.