34results about How to "Improve the success rate of exploration" patented technology

The invention discloses a determining method of complex mountain-front effective source rock and a source rock structural model. The method includes the steps of implementing spatial distribution of potential source rock, restoring erosion thickness of different structural unit formations, restoring features of a paleo-geothermal field, determining hydrocarbon conversion type of the source rock by numerical simulation, and determining distribution of the complex mountain-front effective source rock according to the spatial distribution features of the source rock, the hydrocarbon conversion types of the source rocks at different positions of the different structural units and features of abundance of organic matters. Meanwhile, by means of the study based on the method of recovering hydrocarbon conversion of the source rocks in the study area, reliability of resource quantity evaluation is improved, the blank in determining the complex mountain-front effective source rocks is filled, and results help greatly boost the progress of next resource evaluation.

The invention discloses an identification method and system for a complex basin edge super-stripped belt subtle trap boundary. The identification method includes the following steps that firstly, structural features of a plane of unconformity are analyzed and defined with data of earthquakes, well drilling, well measuring, well logging and the like as the basis; secondly, a geologic model is designed, forward modeling of earthquake responses is conducted, instantaneous phase earthquake attributes are extracted along the stratum, and a stratum super-stripped line for earthquake identification is depicted; thirdly, a geologic model capable of reflecting the super-stripped concept of the stratum is selected, earthquake forward modeling is conducted, and main factors affecting an error distance are defined; fourthly, an error distance formula under the stratum super-stripped condition is established; fifthly, the stratum subtle strap boundary is described according to the stratum super-stripped line and the error distance for the earthquake attribute identification. According to the identification method and system for the complex basin edge super-stripped belt subtle trap boundary, the position of the super-stripped line for earthquake identification can be accurately described, the subtle trap boundary is quantitatively identified based on an extrapolation formula built through multi-model forward modeling, an oil-gas accumulation boundary can be easily and accurately determined, and the oil exploration risk can be effectively lowered.

The invention relates to the field of microorganism oil-gas resource exploration and discloses a method for oil-gas resource exploration indicating by utilizing molecular ecology. The method includes utilizing a molecular ecology studying means to calibrate fingerprint spectra of microorganism species in topsoil or sediment; comparing the fingerprint spectra with references of point locations where underlaying oil-gas reservoirs exist in a known manner to complete dividing of potential abnormality areas and background areas of oil-gas resources. By the method, abnormality dividing of potential oil-gas-resource-containing areas can be realized more accurately, so that exploration success rate is increased.

A method applying seismic layer velocity to identify a shale gas sweet point comprises the steps that a shale bed section is optimized from a seismic cross section according to the remarkable difference existing between a shale formation interface having strong reflection characteristics and overlying and underlying formations by combining with an exploratory well; according to the characteristic that gas contained in shales causes lower seismic wave propagation velocity, the gas-bearing properties of the shales can be identified according to the anomalies of the seismic layer velocity; on the seismic cross section, the zones having better gas-bearing properties of the shales can be optimized through seismic layer velocity analysis. On a plane, the zones lower in seismic layer velocity anomaly, namely the zones higher in shale gas content, are selected out by analyzing the distribution characteristics of the layer velocity of the shale bed section; fracture distribution density can be researched by arranging ant bodies and observing shale formation earthquake isochronal slices, and further shale gas sweet point zones are identified through fusion with a layer velocity plane graph. By utilizing the method, the problems including prediction limits, distribution prediction and the like of the shale gas sweet point can be effectively solved, the shale gas sweet point zones can be accurately identified, and important geological information and basis can be provided for shale gas exploration and development.

The invention discloses a method for evaluating the shale gas preservation effectiveness in a complex reconstruction area. The method comprises the following steps: (1) selecting an effective hydrocarbon generating shale layer section; (2) evaluating the preservation effectiveness of shale gas in a vertical direction; (3) evaluating the plugging effectiveness of the shale gas in the horizontal direction; (4) evaluating the preservation effectiveness of shale gas; (5) according to the preservation effectiveness of the shale gas in the vertical direction and the plugging effectiveness of the shale gas in the horizontal direction and referring to the water concentration and pressure of a hydrocarbon stratum and number of hydrocarbon oxidizing bacteria, evaluating the advantages and disadvantages of a shale gas preservation condition in the complex reconstruction area, and finally defining a favorable for the development of the shale gas according to the advantages and disadvantages of thepreservation condition of the shale gas in the complex reconstruction area. The method can effectively evaluate the advantages and disadvantages of the preservation conditions of shale gas and further define the favorable areas for the development of the shale gas.

The invention relates to an equal-reflection-angle-interval seismic acquisition and observation method and system. The method is characterized by comprising the following steps: (1) determining a target stratum in a three-dimensional grid-shaped seismic wave speed model; (2) selecting a certain earth surface seismic source point on the earth surface, and determining x-coordinate data and y-coordinate data of an earth surface detection point corresponding to the earth surface seismic source point; (3) calculating the corresponding relation between the seismic wave reflection angle at the targetstratum and the emergent position of the seismic wave propagation ray on the earth surface by adopting a ray tracing method; (4) determining an x-coordinate sequence or a y-coordinate sequence of theearth surface detection point by adopting an equal reflection angle interval method; (5) determining a y-coordinate sequence or an x-coordinate sequence of the earth surface detection point by adopting a conventional seismic acquisition method or an equal reflection angle interval method; and (6) obtaining a coordinate sequence of the surface detection point. The method and the system can be widely applied to the technical field of petroleum seismic exploration.

The invention relates to an equal-travel-time-interval seismic acquisition and observation method and system. The method is characterized by comprising the following steps: (1) determining a target stratum in a three-dimensional grid-shaped seismic wave speed model; (2) selecting a certain earth surface seismic source point on the earth surface, and determining x-coordinate data and y-coordinate data of an earth surface detection point corresponding to the earth surface seismic source point; (3) calculating the corresponding relation between the travel time of seismic waves reflected at the target stratum and the emergent position of the seismic wave propagation ray on the earth surface by adopting a ray tracing method; (4) determining an x-coordinate sequence or a y-coordinate sequence ofthe earth surface detection point by adopting an equal travel time interval method; (5) determining a y-coordinate sequence or an x-coordinate sequence of the earth surface detection point by adopting a conventional seismic acquisition method or an equal travel time interval method; and (6) arranging and combining the x-coordinate sequence and the y-coordinate sequence of the earth surface detection point to obtain a coordinate sequence of the surface detection point. The method and the system can be widely applied to the technical field of petroleum seismic exploration.

The invention provides a method for identifying seismic characteristics of a sand-in-mud thin reservoir. The method comprises the following steps: obtaining seismic wavelets of a target layer; calculating the PAM; calculating the mudstone velocity Vm and the sandstone velocity Vs of the target layer; judging whether the target layer sandstone is concentrated in a half apparent main period or not; calculating the thickness ranges of the resonance strengthening area and the resonance weakening area; constructing a sand-in-mud geologic model with gradually increased sandstone thickness; dividing a target layer into a mudstone area, a resonance strengthening area and a resonance weakening area; under the condition that the Ricker wavelet is given, obtaining a model synthesis seismic record, and marking the reflection range of a resonance area; and performing type division on the seismic waveforms in the resonance area range by comparing with a sand-in-mud geologic model, and establishing a relationship between different types of seismic waveforms and amplitudes and sand body development. According to the method, information on a sand-in-mud type seismic section can be well explained, the information on the seismic section can be utilized to help explanation, sand body development is facilitated, and exploration risks are reduced.

A low exploration new area fault lake basin hydrocarbon source rock SASTF prediction method comprises the steps: confirming hydrocarbon-rich depression in well drilling, calculating the depression total settlement amount of each hydrocarbon source rock development layer series, and solving the minimum value as the lower limit of the developable deep lake-semi-deep lake environment total settlement amount; summarizing the seismic facies of the deep lake-semi-deep lake hydrocarbon source rock stratum, and establishing a deep lake-semi-deep lake hydrocarbon source rock seismic facies identification standard; exploring a depression to be confirmed at a low level, calculating the total settlement amount of the depression, and finding potential developable deep lake-semi-deep lake depression; in the potential developable deep lake-semi-deep lake depression, searching for the depression for developing deep lake-semi-deep lake mudstone according to the depression containing space and sediment supply relation; and finally, comprehensively considering the lake basin type, and predicting hydrocarbon source rock spatial distribution in combination with the deep lake-semi-deep lake facies hydrocarbon source rock seismic facies identification standard. The hydrocarbon-rich depression of high-quality hydrocarbon source rock development can be accurately predicted, the oil-gas exploration risk is reduced, the drilling success rate is increased, and the oil-gas exploration cost is reduced.

The invention provides a method and device for predicting the porosity of a deep sandstone reservoir, and the method comprises the steps: determining a time-temperature index TTI of each position point of a well logging according to the formation temperature data of each position point of the well logging; establishing a sandstone reservoir porosity prediction model according to the sandstone reservoir porosity, the sandstone reservoir granularity, the quartz content and the TTI of each position point of well logging; obtaining formation hierarchical data and ground temperature gradient of the target interval; determining the TTI of each position point in the target interval according to the formation hierarchical data and the ground temperature gradient of the target interval; and determining the sandstone reservoir porosity of each position point in the target interval according to the TTI of each position point in the target interval and the sandstone reservoir porosity prediction model. According to the method, by introducing the TTI, the geological effect brought by the geothermal field can be accurately characterized, so that the prediction accuracy of the porosity of the deep sandstone reservoir is improved, subsequent development is better guided, and the exploration success rate is improved.

The invention discloses a system for utilizing logging porosity data to carry out reservoir correlation and prediction. The system comprises a stratum track, an electric logging curve track, an altitude depth track, a lithology track, well logging interpretation porosity curve track, a high-quality reservoir section of well logging interpretation and a porosity color icon. The invention also discloses an application method of the system for utilizing the logging porosity data to carry out the reservoir correlation and the prediction. According to the application method of the system for utilizing the logging porosity data to carry out the reservoir correlation and the prediction, which is provided by the invention, the distribution and section change features of the high-quality reservoircan be clearly and intuitively shown and the exploration success rate can be effectively improved; the prediction of the inter-well high-quality reservoir is realized to provide a very important technical support for selection and deployment of a well location target.