| It was proved that the main exploration target in mid-Tarim area should be the Ordovician carbonate karst reserviors. But the exploration level of Ordovician in mid-Tarim is low although Zhong-1 low uplift and multiple stage karsts in Ordovician have been found. The characteristic of Ordovician oil and gas reservoirs are multi types with thicker oil-bearing section. Reservoirs"shape are independent of abnormally pores fractures and cavities with heavy heterogenesis. Reservoir is the main control factor of Ordovician hydrocarbon enrichment .The theme was based on sufficient investigatng, mastering and digesting present information. Follow the direction of up to date opinion, theory and method of various disciplines like modern stratigraphy, sedimentology and lithology, reservoir geology, karst geology, and petroleum geology etc. Integrated analyzed well data, drill core, well log and seismic data by macroscopy and microscopy, had breakthrough development and had remarkable exploration fruitage.The goal of this theme is by studying the Ordovician carbonate reservoir lithological, diagenesis and sedimentary facies features, understanding the accumulate space of reservoir, pore structure and type, acquiring physical property parameters of Ordovician carbonate reservior, establishing the techniques of carbonate reservoir identifying, evaluating and predicting, establishing karst reservoir developing mode, forming stages and developing scale , predicting karst reservoir and paleo-weathering crust reservoir spatial distribution, clarifying vertical and horizontal distribution of karst reservoir, analyzing the key control factors and patterns of the reservoir-forming, pointing out the perspective area and target of exploration, to deepen the relationship between carbonate paleo-karst geology and hydrocarbon reservoirs, and to establish prediction techniques of Ordovician karst, further more to enrich the relevant theory of carbonate geology.
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