615 results about "Petroleum exploration" patented technology

The invention discloses a prediction and evaluation technology of 3D seismic optimum time window river channel sand body reservoirs, belongs to the technical field of the prediction and evaluation of the 3D seismic reservoirs, and aims at solving technical problem that the river channel predictive resolution of the traditional methods is not enough. The technical proposal is as follows: the 3D visualization scanning is performed on each reservoir at the interval of 1-2ms, the optimum time window is determined according to the scope shown by the target river channel, the corresponding subfield is cut out, clairvoyance and scanning are carried out on the time window properties, such as root-mean-square amplitude, wave impedance and the like, auto-tracing is performed, top surface and bottom surface are picked up, a time isopach map is calculated and converted into a sand body isopach map, a top surface structure diagram is formed by time-depth conversion, and the reservoir physical properties are evaluated by curve reconstruction, thus realizing the prediction and evaluation of the plane morphology, longitudinal thickness and the reservoir physical properties of the river channel sand body. The method adopts the optimum time window to effectively inhibit interference, is applicable to various data volumes, and can effectively predict and evaluate a thin river channel sand body with the thickness far less than 1 / 4 of a wavelength under the condition of frequent interbedding of sand and mudstone, the thin river channel sand body comprises the river channel sand body which is not corresponding to wave crest or wave trough, and the method has good application effect in petroleum exploration and development.

The invention is an entirely new application of domain characterization generated by Voronoi tessellation, which is very close to realistic geology and computation of gravity response of such domain, which has three dimensional fractal basin structure, and is favorable for oil exploration. In this work the interfaces or tessellating domains are represented by a set of parameters, which are referred as Voronoi centers. These parameters can be perturbed by any amount without getting into representational problems as faced by the conventional techniques. To accomplish such representation Voronoi tessellation is used, which in two dimensional space consists of enclosing every Voronoi center by a Voronoi polygon such that the common edge of adjacent polygons is perpendicular bisector to the line joining the Voronoi centers on both the sides of that edge. In this invention instead of using conventional Euclidian distances, the notion of Voronoi tessellation is generalized by using Ldistances, where p can hold any real value so that Voronoi domains are not necessarily polygonal. Desired fractal subsurface is generated using this approach that is quite close to the natural settings than the conventional planer or polygonal representation. Next, the gravity response due to this fractal subsurface structure has been computed. The new invention has a significant advantage over the conventional methods especially in geophysical inversion where initial model parameters are updated in each iteration, which can be done more easily and efficiently by Voronoi tessellation merely by changing Voronoi centers.

A method for stratigraphic interpretation of a seismic image for determining a sedimentary history of an underground zone having application to petroleum exploration. The seismic reflectors of the image are digitized by means of an applied shape recognition technique. At least one attribute characteristic of the structure of the image in the vicinity of each reflector is calculated for a set of reflectors by means of an image analysis technique. This analysis is based on at least one analysis window whose shape is controlled by the associated reflector. Pertinent reflectors, in the sense of the stratigraphic interpretation, are selected from among this set of reflectors on the basis of this attribute. Finally, the sedimentary history of the underground zone is reconstructed from a stratigraphic interpretation of the reflectors thus selected.

The invention relates to a recovery method and a recovery device for multi-cluster sandblasting perforation fluid in coiled tubing, and belongs to the technical field of petroleum exploration and development. In the replacement liquid recovery stage, the present invention opens the valve of the replacement liquid recovery tank, and recovers the replacement liquid into the replacement liquid recovery tank for use in the next cluster of perforations; in the sandblasting liquid recovery stage, opens the sandblasting The valve of the liquid recovery tank is used to recycle the sandblasting liquid into the sandblasting liquid recovery tank for static settlement; after the sandblasting liquid in the sandblasting liquid recovery tank is left to settle for a set time, the sandblasting liquid in the sandblasting liquid recovery tank The sand-free base fluid is transferred to the replacement fluid recovery tank for use in the next cluster of perforations. The invention achieves recovery by alternately using the recovery tanks to settle the perforating sand in the sandblasting fluid, the flow process is simple, no chemical agent is added in the whole treatment process, the operation cost is low, the construction efficiency is high, and the sandblasting fluid and replacement fluid can be realized The effective recovery of perforating fluid reduces the cost of perforating fluid and improves economic benefits.

A method having application for petroleum exploration or geological storage of generating a mesh of a faulted underground medium, comprising generating a hex-dominant mesh from faults and horizons in a form of a 3D triangulated surfaces. Each 3D triangulated surface is converted to a 2D triangulated surface onto which the faults are projected by an isometric unfolding technique. A regular two-dimensional grid pattern is generated for each 2D triangulated surface. The faults are accounted for by deforming quadrilaterals of the grid pattern intersected by projected faults. The deformed regular grid pattern is then converted to a 3D gridded surface and each quadrilateral which is crossed by a fault is converted into two triangles at a level of a diagonal. Finally, after iterating for all the 3D triangulated surfaces, the mesh is generated by creating links between the nodes of neighboring three-dimensional gridded surfaces with respect to the faults.

The invention relates to a continental lacustrine basin slope area stratum lithologic oil and gas reservoir dominant facies prediction method and belongs to the petroleum exploration technical field. The method comprises the following steps that: 1) a slope type is determined through three-element quantitative analysis, namely, buried depth analysis, depositional environmental analysis and hydrocarbon source maturity; 2) single-factor condition depiction is performed on reservoir dominant transport facies, dominant structure facies, dominant diagenetic facies and dominant source rock facies which control oil and gas accumulation conditions; and 3) as for different slope types, overlay analysis is performed to determine the dominant facies of each slope type and determine the development areas of the dominant facies. The prediction method of the present invention is suitable for continental lacustrine basin slope area stratum lithologic oil and gas reservoir exploration, seek and discover dominant facies so as to provide a basis for efficient well location deployment and provide technical support for the discovery of efficient reserve areas.

A signal interpretation engine apparatus and method are disclosed as including a computer programmed to run a feature expansion module, a weight table module, a consolidation module, and a map generation module. The feature expansion module contains feature operators for operating on a signal to expand the signal to form a feature map of feature segments. Each feature segment corresponds to a unique representation of the signal created by a feature operator from the signal across an epoch. An epoch corresponds to an event within a time segment. A consolidation module applies aggregators to consolidate the inner products or superposition segments into a distribution function representing an attribute over a domain reflecting a selected weight table, aggregator, and event type, corresponding to each value of the attribute.