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Research Of The Prediction Of Carbonate Fissure-cave Reservoirs In Tahe Oilfild

Posted on:2011-12-23Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y H ZhaoFull Text:PDF
GTID:1220360302493000Subject:Mineralogy, petrology, ore deposits
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The oil and gas exploration significant breakthrough in Paleozoic marine carbonate on Tahe oilfield, the largest oil and gas fields of Paleozoic marine strata in China, has established the theoretical basis of oil and gas exploration in the marine carbonate rocks. With the deepening of the exploration and development, the difficulties faced by more evident. The regulation of three-dimensional spatial distribution, adjustment and deployment of wells, reserves calculation in the main zone of carbonate reservoirs, the spatial development and prediction techniques of Caledonian reservoir in outlying areas, all need further study and resolve in urgent. In Think of the development geological studies state of Ordovician reservoir in Tahe Oilfield, make use of the comprehensive research methods on geology, seismic, well logging, testing, and the dynamic data, exert multi-disciplinary advantages. Based on the tectonic evolution research, the effect of structural control is deep understood, and the karst mechanisms and distribution regulation is studied, the main areas are researched step by step in detail, and seismic pattern recognition and reservoir prediction are discussed more subtly. Actively search after new methods, new technologies and new ideas, the geophysics response model of fissure-cave reservoir is identified, distribute characteristics and regulation of carbonate fissure-cave reservoir are illustrated, thus further enrich and improve the techniques and methods of carbonate fissure-cave reservoir prediction. The core of this thesis includes the following contents:(1) Tectonic evolution analysis showed that the Tahe area has experienced Caledonian, Hercynian, Indosinian-Yanshanian and Himalayan tectonic movements. The Caledonian tectonic activity of Tahe area is weak, its characteristic is the parallel unconformity formed by the earth crustal uplift. Early Hercynian is the main deformation phase for the Ackule bossy in the south of fracture Luntai. Late Hercynian is the phase when tectonic movements are very active at Jacques bossy in the north of fracture Luntai. Since the late Devonian when the Tabei uplift is formed and finalized to Eogene, the uplift has been in relatively high uplift. Until the Neogene, the Tabei uplift and the Tazhong uplift are much the same depth.(2) Based on the analysis of structural evolution, the fracture characteristics of Caledonian and Hercynian are well definite. It has proposed that the Caledonian karst model is controlled not only by the fracture of karst activity but mainly by changes in the base-level.(3) Using the way of ranging thick time window to select integral of half of the entire waveform, obvious effects of the elaborate waveform classification are demonstrated on the prediction of carbonate reservoirs under the up Ordovician series rock in Tahe oilfield.(4) The first application of supervising waveform classification techniques, can identify reservoir and the compartment, intuitive show the three-dimensional spatial distribution characteristics of carbonate reservoirs, solve the problem of the strong heterogeneity carbonate reservoir predication and the reservoir volume calculation.(5) Tahe oilfield ancient cave system is composed of 11 underground rivers. Focus on analysing the reservoir development characteristics of the 1st underground river S113 band and 4th underground river TK481X-S117 band, the reservoir distribution regulation and prediction methods are clear in the band of the underground rivers.(6) Research on the information of artesian well, well logging and production dynamic data, analysis on geological model, the causes of the strong reflection same axis are analyzed more comprehensively. There are seven kinds of karsts can form strong reflection phase axis, but due to the difference situation of karsts growth and filling, there are difference in production and drilling holes event. This provides a foundation for the deployment of well placement and adjustment.(7) Tahe Oilfield carbonate fissure-cave reservoir is different from other areas at home and abroad carbonate reservoir. By the analysis of seismic response characteristics, establishment of the fissure-cave identification patterns and closely integration with basic research and production practice, a different series of reservoir prediction techniques are build for different regions crack holes that improve the accuracy of the reservoir prediction and promote the technology.
Keywords/Search Tags:Tahe oilfield, carbonate reservoir, tectonic evolution, waveform analysis, reservoir predication
PDF Full Text Request
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