42 results about "Stratigraphy" patented technology

An earth model is formed in real time during drilling of a well by incorporating up-to-the-minute knowledge derived from geology, seismic, drilling, and engineering data. The process of forming the model utilizes Logging-While-Drilling (LWD) or Measuring-While-Drilling (MWD) data directly from the drilling rig as the well is drilled. The LWD or MWD data is sent to visualization centers and compared with other data such as existing geological models, the proposed well plan and present interpretation of the subsurface stratigraphy. The results of the comparison enable experts to analyze anomalous results and update the geological model within minutes of penetration of a formation during drilling. Well drilling efficiency is improved, and an “on-the-spot” road map is provided for maximal reservoir contact and pinpoint accuracy.

Methods and systems are provided for displaying and forecasting the lithology and wellbore conditions to be encountered while conducting drill string operations are conducted in a wellbore. A method and system is described for predicting and modeling lithology while operating a drill string in a wellbore, comprising: developing a 3-D lithological model of a subsurface area; projecting a well path through said subsurface area; determining an open cylinder lithology display of said projected well path; and recording said determined open cylinder display. The open cylinder lithology display (the Predictive Stratigraphy Image) may be displayed with geological or structural cross-sections to compare the well path and the predicted well path, with the actual subsurface environment. Data acquired during drilling operations can be used in real time to update the model or the Predictive Stratigraphy Image, and the results compared with Predictive Image Logs and other wellbore images and data.

A seismic interpretation method for identifying subsurface hydrocarbon bearing traps of Eocene/Paleocene age in valley fill depositional systems comprising as computer implemented modeling software and processed seismic data. The valley dispositional system is further defined by identifying field stratigraphy and erosional trapping mechanisms and confirming structural closure. The method further includes identifying structural aspects caused by sagging, rollover, and determining the presence of high amplitude events in the erosional trap.

The invention relates to a quantitative evaluation method for the quantity of potential resources around a developed oil field, wherein the method comprises the following steps: a, analyzing the development rule of a reservoir around the developed oil field based on a high-resolution sequence stratigraphy evolution rule, and locking a favorable reservoir development position; b, searching for a seismic reflection interface corresponding to a medium-term cycle reference surface adjacent to the favorable reservoir development position depth, carrying out horizon interpretation, searching for potential sand bodies, and numbering the potential sand bodies; c, carrying out multi-factor analysis on the potential sand bodies, evaluating each potential sand body, and defining a potential reserve unit; and d, determining reserve calculation parameters of the potential reserve unit, and calculating the reserve of the potential sand bodies. The method can be widely applied to potential sand bodyreserve calculation of developed surrounding oil fields of offshore oil fields, and further exploration and development of the offshore oil fields are facilitated.

Stratigraphy is inferred over a volume of seismic information. Seismic images are implemented to create higher fidelity stratigraphic structure by leveraging a process that translates seismic image information back and forth into and out of a space that is flattened on geographic time. The stratigraphic structure inferred may be implemented in seismic modeling

The invention discloses a quantitative recovery method for a carbonate rock stratum sedimentary micro-landform based on a high-frequency cycle, and relates to the technical field of ancient landform recovery. According to the method, sequence stratigraphy is taken as a theoretical basis, basic data information is fully applied, a spectrum analysis technology and a multi-scale matching method are adopted, an earthquake-logging sequence stratigraphic framework is established, sequence stratigraphic interface types and development characteristics are analyzed, isochronous geologic bodies are determined, and high-frequency cycle combination types and characteristics are acquired. Therefore, quantitative recovery of the carbonate rock stratum sedimentary micro-landform is achieved, the scale and precision of the sedimentary landform can be improved, powerful support is provided for deepening geological understanding and the next exploration direction, and then exploration risks and cost input are reduced.

The invention discloses a high-precision seismic sequence division method. The method comprises the following steps: S01, carrying out fine calibration on synthetic records; S02, obtaining a seismic inversion data volume; S03, performing high-precision seismic sequence division; and S04, predicting a favorable reservoir development area. The method has advantages that a problem that seismic sequence division cannot be carried out due to insufficient resolution of conventional seismic data is solved by using seismic inversion data, high-precision seismic sequence division method research is carried out in combination with seismic sequence stratigraphy, a favorable reservoir development area is searched in each sedimentary cycle, and a direction is pointed out for searching oil and gas resources.

A new gridding method is disclosed for forward stratigraphic modeling that allows for syndepositional and/or postdepositional fault movement. The new gridding algorithm may represent both the lateral move of structure block, and provide efficiency that is comparable to the structured grid for forward stratigraphy model accessing previous deposited sediments stored in the grid. Embodiments of the disclosed methods allow for structural moves by performing a set of simple operations on the grid. The operations are generally simple, and do not change the overall topology of the grid. Therefore the operation can be easily repeated and the overall topological structure of the grid remains largely unchanged for simple access by the forward stratigraphic model. Further details and advantages of various embodiments of the method are described in more herein.

The present invention relates to a method for updating a stratigraphic model according to measurements performed in a basin. The method comprises steps of i) determining at least a first spatial distribution of the values of an attribute representative of the basin stratigraphy, and applying a classification method for converting this first spatial distribution to a first classified image; ii) performing a stratigraphic simulation with first parameter values of the simulation, deducing therefrom a second spatial distribution of the values of the attribute and applying the same classification method identically to determine a second classified image; iii) determining a distribution of local dissimilarities between the first and second classified images, and modifying the values of at least one of the stratigraphic simulation parameters to minimize an objective function formed from at least the local dissimilarity distribution; and iv) updating the stratigraphic model by performing at least one stratigraphic simulation with the modified simulation parameter values.

The invention discloses a fracture development degree characterization method, which comprises the following steps that: a high-resolution sequence stratigraphy method is adopted to determine the calculation step length of fracture strength, and the value of the calculation step length is a sedimentary cycle thickness similar to seismic data identification accuracy; crack basic parameters comprising the number of cracks and crack inclination angles are acquired; the crack linear density and the crack apparent cutting ratio are quantitatively calculated through a fixed step length and windowingmethod, the crack linear density is the ratio of the number of cracks in the calculation step length to the calculation step length, and the crack apparent cutting ratio is the ratio of the sum of tangent values of crack inclination angles in the calculation step length to the calculation step length; and the fracture development degree of the single-well coring well section is characterized according to the fracture linear density and the fracture apparent cutting ratio. On the basis of research of a high-resolution sequence stratigraphy method, the definition of the linear length in the fracture linear density is perfected by clearly calculating the step length, and the fracture development degree difference caused by the fracture inclination angle difference is solved by adopting fracture apparent cutting ratio quantitative characterization.