鄂爾多斯盆地富縣地區(qū)奧陶系風(fēng)化殼儲層特征
[Abstract]:Fuxian Block is located in the southeast of Ordos Basin. The Caledonian movement made the stratum uplift eroded and formed large-scale paleokarst weathering crust. In view of this, it is imperative to study the weathering crust reservoir in the study area. On the basis of core and microscopic thin section observation, this paper makes full use of drilling, logging and logging data, and combines production test results to Hubei province. The karst palaeogeomorphology and karst reservoir characteristics of Ordovician weathering crust in Fuxian area of Erdos Basin are studied.The residual condition of weathering crust is defined by stratigraphic division and correlation.The palaeogeomorphology of weathering crust is depicted by using "impression method", "residual thickness method" and palaeogeo-geological map. On this basis, the physical characteristics, reservoir space types and diagenesis of karst reservoirs are discussed in detail, and the main controlling factors for the development of karst reservoirs are summarized. The main achievements of this paper are as follows: (1) Through the restoration of paleogeomorphology in the study area, the paleogeomorphology in the study area is defined. The karst slope is the most important geomorphic unit, which is distributed in a wide band from north to south. (2) Five kinds of karst facies are developed in the study area, including fractured breccia facies, mosaic breccia facies with low gamma, low neutron value and medium-high resistivity. Chaotic breccia facies, complex base supporting chaotic breccia facies, filling sandy conglomerate facies with medium-high gamma, medium-low resistivity and other characteristics. (3) Karst reservoir heterogeneity is strong, in the supergene bare period suffered strong paleokarstification, forming a large number of dissolved pores, caves, fractures and other reservoir space, through deep burial stage, compacted, filled and cemented. (4) The main controlling factors of karst reservoir development are palaeogeomorphological factors and karst facies factors. Slope platform and slope platform margin where fracture breccia facies and mosaic breccia facies are relatively developed are favorable areas for the development of weathered crust karst reservoir in the study area. A large number of coring data and logging data, combined with the above research methods, further clarify the characteristics of the lower-middle Majiagou formation karst reservoir and its development control factors, for the next step of natural gas exploration in this area has reference significance.
【學(xué)位授予單位】:成都理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P618.13
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