墾東北部地區(qū)古近系地質(zhì)特征及油氣成藏條件
[Abstract]:The northeast of Kendong is located in the shallow sea area of the northern slope belt of Kendong uplift. Many oil-bearing strata such as Shahejie formation, Dongying formation and Guantao formation of Neogene have been found in this area, which is a compound oil and gas accumulation area. The controlled reserves of the Paleogene system have been reported to be 3.31 million tons in the northeast of the Reclamation. All the wells of Kendong 88Gian 89893, which have been drilled recently, have obtained high-yield industrial oil flow, which shows the great exploration potential in the area. Therefore, the systematic study on the geological characteristics of Paleogene and its oil and gas accumulation conditions is of guiding significance to the practice of oil and gas exploration in this area. Based on the basic data of earthquake and drilling, this paper analyzes the laboratory data by using abundant seismic, logging, core, and so on, and focuses on the characteristics of structural stratigraphic development in the study area. The distribution law of sedimentary reservoir and the system of main controlling factors of reservoir formation have been deeply studied, and the following results have been obtained: 1. The tectonic evolution is controlled by the control and influence of regional stress field and the activity of Tanlu fault zone, and has experienced the strong extension from Paleogene to Paleogene. The transition of weak strike-slip to the stage of neotectonic movement with weak tensioning and strong strike-slip. The tectonic high zone in this area is of tensional tectonic origin and its boundary faults were tensional and torsional during Paleogene. Single tensional-torsional fault activity often results in uplift structure. The main faults in this area are characterized by strong activity in the fourth and third periods of sand, followed by a decreasing trend of activity, and a slight increase in activity in the first stage of sand. To Dongying formation fault activity tends to stop. The Cenozoic tectonic evolution in the area experienced the stage of limited fault subsidence from Kongdian to Sha 4, and the stage of strong fault subsidence from the top of Sha 4 to the second stage of sand. The main sedimentary facies types and development rules of Paleogene in each period of Paleogene are defined in the weak fault depression stage from Sha 1 to Dongying period and weak extensional depression stage in Neogene. Through single well facies analysis, it is considered that five sedimentary facies types are mainly developed in Shahejie formation and Dongying formation in this area. That is, fan delta, carbonate beach dam, sandy beach dam, shallow lake, semi-deep lake, etc. The Paleogene reservoir types in Kendong area are mainly structural reservoir, next stratigraphic reservoir. The vertical distribution of the reservoir is controlled by stratigraphic development and regional caprock, and the plane distribution is controlled by the tectonic background and the law of stratigraphic overstripping. According to the difference of reservoir formation law of different structural zones, the "unconformity and fault transport type" hydrocarbon migration and accumulation model of uplift slope zone is established.
【學(xué)位授予單位】:中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:P618.13
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