冀中坳陷饒陽凹陷中深層有效碎屑巖儲集層發(fā)育機理研究
[Abstract]:Raoyang sag is an important oil and gas production base in China. However, the reservoir depth of Shahejie formation is large, the diagenetic evolution process is complicated, and the oil and gas exploration theory is not perfect. Therefore, the study on the mechanism of reservoir development, especially the development mechanism and distribution of high-quality reservoirs in Raoyang sag, has practical reference value for the exploration of middle and deep layers in Raoyang sag. Based on drilling, logging, core, thin slice and previous research results, this paper discusses the development model of high quality reservoir of Xiasha River formation in sequence stratigraphic framework, and sets up a set of criteria for identifying diagenetic facies of logging in the study area. The development mechanism and main controlling factors of high quality reservoir are revealed. The results show that the third member of Shahejie formation in Raoyang sag is a second-order sequence, which can be further subdivided into three third-order sequences, each of which is low, lacustrine transgressive and high-level system tracts. The sequence interface controls the dissolution of sand bodies and carbonate cementation under the interface, but does not constitute a dominant channel for fluid migration, thus promoting the dissolution of sand bodies above the interface. The sand and mud of low system tract are mixed, the compaction ability is poor, the primary pore is not easy to be preserved, and the early carbonate cementation is easy to precipitate from the supersaturated alkaline water. The granularity of the sandstone in the lacustrine transgressive system tract is fine, but the separation is good. The primary pores can be preserved in the early diagenetic stage, and they are in direct contact with the source rock, so it is easy to accept organic acid dissolution to form secondary pores. In the upper system tract, the sandstone grains are coarse and well sorted, the sediments have strong compaction resistance, relatively shallow burial, easy preservation of primary pores, and influenced by the upper layer sequence interface, the secondary pores are formed in the early diagenetic stage by atmospheric fresh water leaching. In addition, the late filling of organic acid can further promote its dissolution, so the reservoir quality is the best. The diagenetic evolution models of syngenic, early and middle diagenetic stages of sandstone in different system tracts are established, and the diagenesis characteristics in sequence stratigraphic framework are pointed out, which can realize the correlation and tracing of high quality reservoirs. In addition, the study of diagenesis and diagenetic facies of sandstone reservoir shows that the sandstone reservoir of formation 3 has undergone diagenesis, such as compaction, cementation, dissolution and fracture, and is now in stage A of middle diagenesis. According to diagenesis types, strength and diagenetic minerals, diagenetic facies are divided into five diagenetic facies: compaction, clay mineral filling, carbonate rock cementation, unstable component dissolution and medium compaction weak cementation. The logging identification standard of each diagenetic facies is established, and the diagenetic facies in single well are identified and divided. It is clear that the medium compacted weak cemented facies and the unstable component dissolution facies are two constructive diagenetic facies. The middle compacted weakly cemented phase developed layer is generally characterized by a low GR, medium to high acoustic time difference and a large range of resistivity changes. The unstable component corrosion phase is characterized by low GR and wide range of resistivity variation, and the acoustic time difference is generally medium. The genetic mechanism of abnormal high porosity reservoir in middle and deep depth in Raoyang sag is expounded. It is pointed out that high composition and structural maturity, early oil and gas filling, overpressure development of pore fluid and dissolution are the main controlling factors for the development of high quality reservoir.
【學(xué)位授予單位】:中國石油大學(xué)(北京)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:P618.13
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