Abstract
The Ordovician in Yubei area is an important target and production layer of marine carbonate exploration in Tarim Basin. In order to understand the reservoir distribution and therefore to promote exploration, by means of analysis of cores, rock sections, casting sections, logging data of Ordovician carbonate reservoirs in the Yubei area, the reservoir petrology, diagenesis types and characteristics of the carbonate rocks in the study area are systematically studied, and the identification marks, development rules of various diagenesis and their influence on the formation of the reservoir are summarized. The results show that the carbonate reservoir in the study area is mainly composed of 4 types: mud micrite limestone, grain limestone, biological limestone and dolomitic limestone. In combination with core photos and imaging logging analysis，reservoir can be divided into pores and cracks, which are fracture type and fracture pore type. The diagenesis types of carbonate rocks in study area are complex and diverse, mainly including compaction, pressolution, cementation, filling, recrystallization, dolomitization, dissolution. To sum up, the main constructive diagenesis include recrystallization, dolomitization, dissolution, otherwise the main destructive diagenesis include compaction, pressolution, cementation, filling. The above research results on the diagenesis of carbonate rocks has a certain role in promoting the development of oil and gas exploration in the central Tarim Basin.
Highlights
The diagenesis of carbonate rocks refers to the various physical, chemical and biological changes that change the properties and structural characteristics of the sediments and sedimentary rocks during the long period from the end of deposition to bedore metamorphism, which has an important impact on the physical characteristics of carbonate reservoirs
In July 2010, yubei-1 well obtained industrial oil flow in Yingshan formation of Ordovician, and it made a breakthrough in oil and gas exploration of Ordovician carbonate reservoir in Maigaiti Slope of Tarim Basin, which confirmed that there are abundant oil and gas resources in the Ordovician of Maigaiti Slope
Yubei area is located in the eastern maigaiti slope of tarim basin, whose northern border is bachu uplift Mazhatage fault zone, eastern border extends to Tangguzibasi sag, and southern border yecheng—hetian sag of south-western depression
Summary
The diagenesis of carbonate rocks refers to the various physical, chemical and biological changes that change the properties and structural characteristics of the sediments and sedimentary rocks during the long period from the end of deposition to bedore metamorphism, which has an important impact on the physical characteristics of carbonate reservoirs. The physical properties of carbonate reservoirs are mainly affected and controlled by sedimentary facies, diagenesis and tectonism, while tectonism only affects specific areas. In July 2010, yubei-1 well obtained industrial oil flow in Yingshan formation of Ordovician, and it made a breakthrough in oil and gas exploration of Ordovician carbonate reservoir in Maigaiti Slope of Tarim Basin, which confirmed that there are abundant oil and gas resources in the Ordovician of Maigaiti Slope. Along with the deepening of exploration, there are more researches to discuss the characteristics and genetic analysis of the ordovician reservoir in Tarim basin, putting forward a variety of the main controlling factors of diagenesis [6,7,8]. On the basis of a large number of core observation and thin section identification, using of the geochemical data, author probes into the ordovician diagenesis of this area, so as to provides the basis for exploration and development
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