|
At a stage of carrying out detailed exploration research on oil and gas the basic attention is devote to already allocated structures and also studying and revealing non-traditional, first of all non-anticline traps of oil and gas (NAT). Thus, the great value is got classification NAT, creation their geology-geological and seismic-facial models. The decision of the last carries out by stratigraphically modeling of the wave fields within the limits of separate seismic facial zones and lateral heterogeneities. The overall objective of the given modeling is the estimation a influence of oil and gas deposits, zones of unconformable overlapping and lithology-facial replacements and also others lateral heterogeneities on various characteristics of seismic record (change of amplitudes, frequencies, polarity, distortion of a relief of the separate reflecting horizons, etc.). All this allows planning system of tests for revealing lateral heterogeneities, displayed on synthetic two-way-travel time cross section, with the purpose of their further comparison to real CDP two-way-travel time seismic cross section. The important component at carrying out of bi-dimensional modeling of seismic-facial zones or lateral heterogeneities is construction of geology-geophysical model of the investigated object. The given model should reflect more precisely the geological structure, including a relief of separate horizons, lithology, petro-physical properties and thicknesses of layers.
On the basis of lead the seismic stratigraphy and seismic facial analysis of the CDP two-way-travel time seismic cross section, by us in an interval of Jurassic complex of the Turanian platform there are preliminary allocated separate lateral heterogeneities connected with both zones of tapering out of separate layers (clinoform packs, zone of unconformable adjacent layers to the pre-Jurassic surfaces, erosive sheared) and facial transition between different types of lithology (along coast sand bar and reefs). For each of these heterogeneities there are constructed geology-geophysical and seismic facial models.
The developed geology-geophysical models and models of theoretical wave fields have essentially raised reliability of the carry out interpretation of seismic data which have allowed to plan system of tests at revealing lateral heterogeneities and to classify them on types of non-anticline traps of oil and gas.
|
