| Kuche depression in Tarim basin is one of the main exploration blocks of Petro-China and in recent years, it is also a geological exploration and production hot spot. Previous studies indicate that Kuche foreland basin a foreland basin that deposited by the overthrusting of TianNan Mountain, which led to basin’s circuitous depression. Kuche foreland basin lower cretaceous series mainly has medium-grained, fine-grained sandstone layers. The degree of prospecting is relatively higher in the eastern part of Kuche depression, while lower in BAICHENG depression. According to the comprehensive study of study field. Sedimentary facies development and main control factors of Neogene Kangcun-Kuche formation are analyzed systematically. The study of Neogene Kangcun-Kuche formation sedimentary facies has been carried out to provide provide theory support for explorating fine blocksAccording to the drilling results, the Kuche depression in the bottom strata of Jurassic, Triassic, Cretaceous, third, Paleogene, Neogene, quaternary. The Neogene Kang villageKuche group is the research purpose of this topic layer. In recent ten years, the scientific research nits and colleges in Kuche depression is a large number of studies on sedimentary facnalysis, made a lot of research, the results of this paper bring enlightenment at the same time, also brought a lot of new thinking, sedimentary facies, sedimentary facies changes quickly, the division of sedimentary micro is there are a lot of controversy on the Kang Cun, Kuche group is not deep. This paper takes the central area of Kuche depression of Neogene Kang village-Kuche group as the research object. On the modern sedimentology, sequence stratigraphy, seismic principle, structural geology theory as the guide, through the analysis of outcrops, drilling, logging and seismic data in the study area, combined with the core observation, thin section identification data, the Kang village Kuche groupsedimentary system, structural characteristics are discussed in detail analysis, and the sedimentary facies are predicted. Detailed study of road from outcrop and drilling combined, combining macro and micro, point to the comprehensive evaluation, from the detailed study of single factor to combine all the data of sedimentary facies analysis of deepening the study, obtained the following conclusions:On the basis of core accurate description, according to logging and seismic attribute data in the study area, analysis of the rock type, sedimentary structure, sedimentary sequence and facies marks, combined with regional settlement context, that the study area for the development of flood plain of the meandering river depositional system; and identify the riverbed, river banks, and oxbow lake 4 subfacies. Under the premise of understanding phase, the north and South-east deposition in two directions is connected well sections and sedimentary facies of study area, Kuche group from top to bottom and sedimentary evolution of the rules is dominated by water in river facies, mainly to the bank a combination of high water period of subfacies, and finally to the flood of river facies, overall showing a lake in the ascending half cycle characteristics.(1) in the study area, the micro facies in the horizontal distribution, the sand body are communicated with each other, good continuity, mudstone interlayer thin, laterally discontinuous, has the characteristics of large thickness, wide distribution in space. Overall, the study area is mainly the study of sedimentary facies distribution through the meandering river facies, the sedimentary facies distribution in the central part of Kuche depression characteristics and provenance direction. It also discusses the main factors controlling the deposition of sedimentary facies:influenced by paleostructure, paleoclimate andpaleo geomorphology, biological materials and other factors, the palaeogeomorphology and tectonic controlling factors.(2) through the study of provenance and sedimentary system evolution analysis of transverse research, comprehensive analysis of clastic components, portfolio analysis and ancient water of heavy mineral analysis of Kuche depression in the middle of the sources of sediments a comprehensive system of research, and the source from multiple directions. The Northern Tianshan Mountains with multiple source entrance, followed by one of the Wensu uplift is the main source of the west;(3) to observe the fine core:the core of Dabei area of sedimentary micro facies fine description, and the sedimentary microfacies of Dabei area was divided in detail, and carries on the contrast, provide the basis for the division and correlation of strata. The sediment core from standard well integrated histogram. On the basis of the combination of seismic, logging, sedimentary facies fine research.(4) deposition in Kuche depression of Kuche Kang village group is divided into six layers of mapping, there is progress in the sedimentary facies, sedimentary system partition set. Especially the Kang village-Kuche base section and two section of the reservoir sedimentary facies relatively predecessors have some progress:the former is as a whole to study the distribution of sedimentary facies in one section and two section respectively, and the two segment.(5) the study area Kang village-Kuche group from top to bottom is divided into three sections, the deposition time of two was the longest, deposited in a large segment of the fine sandstone, through research and analysis of well logging data, the lithology characteristics, the overall performance of the transgressive process, three Kang Village-Kuche group reservoir is lake basin expansion during the period of natural levee, the Kang village-Kuche group in two, because of the strong tectonic movement and the western Wensu uplift to the rapid uplift of the basin began to shrink, and the sedimentary facies have a relatively large change, the development of the floodplain, Kuche tectonic movement tends to be smooth, the sedimentary facies has not changed much, and the deposition of Kang village group is basically the same. |
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