The Prediction Technology Research Of Tight Sandstone Reservoir Xinchang Gas Field

The reserves of tight sandstone gas reservoirs is great.The world’sunconventional tight clastic gas resources75-100×10¹²m³is not yet fully developedstage. The application of modern technology can be exploited tight clastic gas reservesis about10.5-24×10¹²m³. The huge amount of its resources, recoverable resources isconsiderable. Tight clastic gas reservoirs are widely distributed in China, but thedegree of exploration and research is generally low, will become our most importantand most growth potential energy.Papers to be looked Xinchang gas field sub-paragraph TX₄⁹tight sandstone gasreservoirs as the research object.Fine contrast of the small layer of sedimentarymicrofacies on the basis of in-depth analysis of reservoir log seismic responsecharacteristics, establishing an effective reservoir prediction mode, and make full useof the seismic data seismic facies of the main reservoir depositional model forconstrained predictivelayer distribution of small fault identification and prediction offracture belts, the use of a variety of technical means to achieve to be lookedsub-paragraph tight reservoir.Sequence stratigraphy theory under the guidance of the well-shock fine contrast,the study area to be looked sub-segment is divided into three sand group. Which theTX₄⁸sand group in the entire study area is generally developed as a set or sets ofconglomerate, the sandwiching mudstone; the TX₄⁹sand group is mainly sandstone orsand and conglomerate interbedded folder thin shale beds, the new field to be lookedthe subsegmental main layer, but also the thesis study. The TX₄¹⁰sand group was tobe four at the bottom of a set of unstable sandy conglomerate combination ofrelatively small thickness.Because TX₄⁹lithology combination is more complex, sandstone effectiveinformation be concealed lithology combination according to the different types of theTX₄⁹sand group produced a number of forward model inversion sandstone sensitiveparameters optimized, extract the amplitude, frequency and other attributessandstonearea into the qualitative prediction of; In addition, the use of prestack AVO inversionof FFP maximum likelihood lithology body, the quantitative prediction of sandstone;Under sub-paragraph TX₄⁹depositional environment for the braided river delta front subfacies plane on the development of multiple superposed lobes body,according to drilling data combined with core analysis results, that the favorablereservoir of sandy conglomerate interbeddedsand body, the favorable sedimentarymicro for underwater distributary channel, followed by a mouth bar. Seismic faciescharacteristics, and prediction of favorable sedimentary facies.To carry out the geometric properties of the PP wave fracture prediction, shearwave splitting, coherent high-frequency data, the3Dmove fracture prediction, andpredictions based on a variety of cracks, the cracks of the tight sandstone reservoircomprehensive forecast.Integrated reservoir prediction, fracture prediction results, combined into thepossession of the master factors, a comprehensive forecast to be looked subsegmentaltight sandstone reservoir.