Abstract
Oil layer A of T oilfield has a low development degree. At present, there are 5 medium and highyield wells in the area, showing a good evaluation and development prospect. In order to understand the reserve potential of this area, the reservoir forming law and reservoir characteristics are further analyzed by analyzing the structure and reservoir development characteristics. The research shows that Oil layer A has two types of reservoirs: one is structural reservoir, which is distributed in the large structural trap near the Aogula-Halahai fault zone in the east of the oilfield. It is characterized by close oil source, short migration path and stable reservoir development. It is a "large and enriched" reservoir. The other type is lithologic reservoir, which is distributed at the sedimentary end of the western structure of the oilfield, and is characterized by distant oil source. After long-distance secondary migration, it is greatly influenced by the development degree and physical properties of the reservoir, but it is a "small but fat" reservoir with high oil saturation. On the basis of clarifying reservoir types, characteristics and evaluation ideas, this paper carries out reserve optimization classification, and selects three potential areas: block Y1 and block Y2 which are mainly controlled by structure and block Y3 which is controlled by lithology.
Highlights
T Oilfield is structurally located on two secondary structural units, Longhupao-Da'an Terrace and QijiaGulong Sag in the western part of the central depression area in the northern Songliao Basin
According to the geological understanding of Oil layer A in the T oilfield, the evaluation ideas are determined: First, look for structural oil reservoirs formed by structural traps near the eastern Aogula-Halahai fault zone
According to the above evaluation ideas, three potential blocks of Oil layer A are selected: the structural high part with large structural traps developed along the eastern fault zone, blocks Y1 and Y2 with good reservoir physical properties, and block Y3 controlled by lithology in the west (Figure 8)
Summary
T Oilfield is structurally located on two secondary structural units, Longhupao-Da'an Terrace and QijiaGulong Sag in the western part of the central depression area in the northern Songliao Basin. Previous studies mainly focused on the Sapu and Gaofu oil layers in the lower part [1,2,3,4,5,6]. Previous studies on Oil layer A are relatively few, which restricts the upgrading and effective production of Oil layer A reserves in this area. Three potential blocks of "big but rich" and "small but fat" reservoirs are found, which are used step by step according to the reservoir implementation degree. It has certain guiding significance for the exploration and development of Oil layer A of T oilfield and similar oilfields
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