High Resolution Sequence Stratigraphy Characterization Based On Well Information

Through the investigation on the demestic and foreign high resolution stratigraphy theory and application, focused on the well information, based on the theory of establishing isochronous formation frame, startted with the stratigraphy genesis and evolvement, stressed on the intuition characterization method of high resolution stratigraphy by well information, the isochronous formation frame of study region is established. The favorable sand body and the distribution rule of oil and gas reservoir can be predicted. a commercial stratigraphy characterization software was developped.The major conclusions are as follw:1. Aimed at the controversy in the sequence stratigraphy, combined with the practical problems in high resolution sequence stratigraphy theory and application, through the analysis of the relative document,based on the systematicially analysis the limitation of A/S theory, the dissipation system theory of squence stratigraphy genesis is firstly presented and the sediment pile, diagenesis and the deposition evolvement are thought to be the result of system dissipation. The formation of deposition stratigrphy mainly depend on the energy of deposition system and the total volume of deposition. The accomdation space acts as an adjustment function, and therefore the rock sequence stratigraphy is decided by the depositional system energy(F), the deposiional flux(S) and depositional system dissipation characteristic (T), and it also is controlled by accommodation space. All of these are called four factors(FAST) theory.2. Ander the guiding of the formation genesis four factors, considered the global sedimentary rock volume and number of basins, the classify thought is proposed: the high resolution squence stratigraphy formation frame can be set up no more than 7 levels, the smaller scales stratigraphy are taken as autocyclicity deposition, and at these scales only the depositional cycle can be analysed and the squence stratigraphy analysis need not be done. The deposition scale is a consquence of interact of sediment in time domain and apatial domain. The classify standardize of rock volume scale realized the unity of time and space, and have a better comparability, and more easily to unite the different understandings of division of squence stratigraphy.3. Followed the instruction of squence stratigraphy and high resolution squence stratigraphy theory, the present problem in the high resolution sequence stratigraphy theory and appication are systematacially studied, within the restriction of seismic squence stratigrahy, by using high resolution character of well information, transfer the conventional division method of squence stratigraphy in which the division depend on sequence stratigraphy interface recognition and formation cycle division to using the squence stratigraphy geneisis theory .i.e.the deposition energy, accommodation space, the depositional scales and structure, depositional interface in order to gain more reliable isochronous formation frame. The sequnece stratigraphy corresponding relations are study in outcrop, core, well drilling, seismic and geograohy. The depositional environment and formation cycle character indicator are study in well drilling, mud logging, well logging, well testing, core analysis, fliud testing, production behavior,well repairing. The well information fusion and focusing theory are presented to divide the high resolution sequnece stratigraphy and the corresponding high resolution sequnece stratigraphy characteristic methods are studied.4. Based the high resolution sequnece stratigraphy characterization methods research with the sequnece stratigraphy genesis four factors theory, the commercial application flow chart and regulations proposal are presented. Firstly, the regional depositional background,depositional enviornment and depositional scales must be carefully studied in order to determine the division levels of high resolution sequnece stratigraphy; Seondly, the sequence stratigraphy indicators of the mainly well in time domain and space domain are established; Thirdly, on the basis of unity of the dissipation system scales, the high resolution sequnece stratigraphy characterization model is biult; Forthly, the high resolution sequnece stratigraphy characterization is done by single well and multiple wells; Fifthly, the high resolution sequnece stratigraphy characterization is done under the well controlling in two dimensions and three dimentions; Sixthly, comprehensive geography analysis and reservoir prediction are done. Normalization of the high resolution sequnece stratigraphy ananlysis is benificial for quantification of the obtained results of high resolution sequnece stratigraphy and improvement of the reservoir prediction accuracy.5. Based on the well information, the high resolution sequnece stratigraphy characterization software was developed. The software has been applied in Xinjiang Karamai Oil Field ,Shengli Oil Field,Jilin Oil Field and Dagang Oil Field initially, and shows its good application effort.