Thin Interbedded Lithology Reservoir Geology, Geochemistry And Seismic Model Response - Paleozoic Reservoirs In The Ordos Basin, For Example,

The Study on Geological and Geochemical Characters with Its Seismic Model Response of finely stratified lithological deposit----The case study on Mesozoic reservoir in Ordos basinFeng jiang (Geochemistry & Sedimentology)Directed by Wang xianbin &Wang duoyunIn this paper, the patterns and characters of continental finely stratified lithological deposit in Ordos Basin are studied from macroscopical and microscopical aspects.In macroscopical aspect, due to the close relation between sedimentary facies belt & paletopography position and formation of reservoir, those Mesozoic reservoirs exist in special facies belts and paletopography. So, firstly, we deduce three depositional system & stratigraphic configuration and their seismic responses (River條ake system, Valley filled system and River?morass system) by using seismic statigraphy. Those seismic reflection characters are generalization all over the basin. It is useful for predicting zone of petroleum enrichment macroscopically through studying depositional stratigraphic model of different Mesozoic stage, comprehending seismic response of different stage抯 stratigrapbic configuration; secondly, we divide corresponding relation between reservoir bed types and their seismic response抯 marks and seismic reflection characters of sedimentary system by using genetic stratigraphy. This is a new method that dominant key element of reservoir formation is clue of studying genetic patterns to determine reservoir bed types. In this paper, we divide reservoir bed to 4 groups, total 16 models and pointed out that cricoid monadnock and slope unaka are two optimal main factors in Jurassic high outcome reservoirs. At last, we generalize judgment characters of reservoirs through resolving forward problem of simulated reservoirs.In microscopical aspect, we study seismic amplitude response when property of reservoir beds and liquid changed. Firstly, we study seismic response characters of thin layers though forward stimulation of single thin layer. Proving that using offset time do not compute thickness of thin layer, but the parameters that have relation with amplitude can do it. Secondly, we put forward for the first time that space configuration and number of thin layers can be get quantitatively in perfect condition by using amplitude parameters. Finally, we study the relations between amplitude parameters (difference of amplitude, sum of amplitude, average of amplitude, total deflection of amplitude, residual mean of amplitude, etc) and property of reservoir beds and liquid by resolving different forward model problems (liquid model, porosity model, hydrocarbon saturation model). At last, we point that it is not true that the higher the frequency of seismic profile, the more accuracy of thickness of thin layers by using amplitude parameters. So, it reduces operation time and cuts down costing of production.