Karst Reservoir Type, Cave Structure and Genetic Model of Ordovician Tahe Reservoirs: Case Study of Fracture-cavity Unit T615 in Tahe Oilfield 7 Block

doi:10.19657/j.geoscience.1000-8527.2020.087

Abstract

Abstract:

The Ordovician Tahe carbonate reservoirs are dominated by karst fractures and caves. With the advance of oilfield development and geophysical surveying technology, the morphology of karst underground rivers has become clearer. However, due to the complex spatial structure, karst products and the types of reservoirs, structures and development patterns of karst reservoirs differ greatly. Take the fracture-cavity unit T615 as an example, we used high-resolution seismic data, together with core logging, FMI imaging logging, and single-well performance data, the reservoirs in the well area are divided into four types, i.e.filling (sand-mudstone filling and fine sandstone filling), collapsed-breccia filling, karst cave (unfilled) and dissolution crack types. Combined with the collected high-resolution 3D seismic attribute characterization data, the distribution characteristics and identification marks of the major products (hall cave, main stream cave, terminal cave, falling water cave and resident water cave) of typical karst systems are studied, and the karst formation is divided into 4 periods. After structural and filling reconstruction, different cave structures, karst products and reservoir types are found in the four-layer cave. Integrating hydrogeology and karst theory, the geological profile of the continuous well karst fractures and caves, and their genetic model in a typical karst system are established. This reveals the combination of fractures and caves between wells, and provides guidance for the description and characterization of karst reservoirs.

Key words: carbonate rock, fracture-cavity reservoir, reservoir type, karst product, genetic model

CLC Number:

TE122.2

XU Jiahong, KANG Zhihong, LAN Xixi. Karst Reservoir Type, Cave Structure and Genetic Model of Ordovician Tahe Reservoirs: Case Study of Fracture-cavity Unit T615 in Tahe Oilfield 7 Block[J]. Geoscience, 2020, 34(06): 1181-1192.

Figures/Tables 14

Table 1 Typical lithology logging response characteristics of well T615 in Tahe Oilfield 7 Block

Fig.1 T615 well fracture-cavity interpretation model

Fig.2 Comprehensive histogram of the reservoir space of T615 well

Fig.3 Karst cave structure map

Fig.4 Dessert attribute graph

Fig.5 RMS three-dimensional model

Fig.6 Cross-well RMS attribute map

Fig.7 Plane distribution map of underground river

Fig.8 Histogram of karst stages (see figure 2 for legend)

Fig.9 Karst paleogeomorphology map

Fig.10 Spatial layout of karst fractures and caves

Fig.11 Distribution map of karst fractures and caves

Fig.12 Well-connecting karst gap geological section map

Fig.13 Development pattern of karst fractures and caves

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