Abstract
In order to clarify the sedimentary development law under the Cambrian Ordovician regional stratigraphic framework in Tadong area, and lay a theoretical foundation for further oil and gas exploration in the study area. The distribution, characteristics and evolution of main sedimentary facies belts of Cambrian Ordovician are studied by means of drilling core observation, cast thin section identification, logging curve feature analysis, seismic profile and well connection profile. The results show that the Cambrian middle lower Ordovician in Tadong area is equivalent to a second-order sequence and can be further divided into 12 thirdorder sequences. Each third-order sequence is mainly composed of transgressive and highstand tracts. Carbonate platform margin beach facies and Reef (mound) beach complex facies are favorable reservoir development facies belts in this area; Under the regional stratigraphic framework, three types of sedimentary facies can be identified in Cambrian Ordovician, and a total of 10 subfacies are developed; The evolution of sedimentary facies is mainly controlled by the rise and fall of sea level, which is characterized by the migration of platform margin facies and the change of platform facies.
Highlights
Carbonate strata are developed in Cambrian-Ordovician in Tarim Basin
Through the research work done by predecessors on sedimentary facies of CambrianOrdovician in Tarim Basin [1-14] provided guidance on the discovery of many large-scale oil and gas fields of reef-beach complex, such as Tazhong slope break zone and Shunnan slope, which indicates that Tarim Basin has a good exploration prospect
After Daqing Oilfield took over the Tadong block at the end of 2012, TJ13, TJ13-2, TJ13-3 and TJ13-4 wells were drilled in Gucheng platform one after another, and high-yield industrial gas flow was obtained, showing the exploration potential of platform facies in Tadong area
Summary
Carbonate strata are developed in Cambrian-Ordovician in Tarim Basin. Through the research work done by predecessors on sedimentary facies of CambrianOrdovician in Tarim Basin [1-14] provided guidance on the discovery of many large-scale oil and gas fields of reef-beach complex, such as Tazhong slope break zone and Shunnan slope, which indicates that Tarim Basin has a good exploration prospect. After Daqing Oilfield took over the Tadong block at the end of 2012, TJ13, TJ13-2, TJ13-3 and TJ13-4 wells were drilled in Gucheng platform one after another, and high-yield industrial gas flow was obtained, showing the exploration potential of platform facies in Tadong area. Due to the lack of drilling in Tadong area in the early stage, little study has been done on the development law of sedimentary facies belt. During Cambrian-Early Ordovician, stable carbonate platform-basin sedimentary system was developed in Tadong area, and its main body was located in deep water basin area, where undercompensated semideep sea-deep sea basin facies was developed, and the deposited dark mudstone was one of the most important source rocks in the basin. Turbid flow basins are developed in Tadong area, and a set of dark mudstone is deposited, which can be used as potential source rocks and favorable caprocks in Tadong area
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