Reservoir Pore Structure and Property Characteristics of Lulehe Formation in the Q6 Area, Kunbei Oilfield

doi:10.19657/j.geoscience.1000-8527.2019.06.06

Abstract

Abstract:

Lulehe Formation (E₁₊₂) is the main hydrocarbon-bearing sequence in Q6 area of Kunbei Oilfield, but the inadequate understanding in the reservoir characteristics (especially pore structure and physical properties) has seriously hindered the oilfield development. Reservoir pore structure and properties characteristics in this area were studied by using the cores, thin sections, scanning electron microscope (SEM), mercury intrusion and experimental analysis, with the aim to clarify the controlling factors of reservoir properties. The Lulehe Formation comprises mainly conglomerate and feldspar-(lithic) sandstones with low composition maturity. Reservoir pore types include primary/secondary pores and fractures, with the primary inter-granular pores accounting for 70.3%. The pore throat is mainly narrow and tubular, and the pore diameter is mainly of 20 μm to 40 μm; According to the shape of mercury intrusion curve, the pore structures are divided into four types (I to IV), and the pore structure is mainly Type II and Type III. Reservoirs in the Lulehe Formation are of ultra-low porosity and low permeability with good pore-permeability correlation. Reservoir properties are controlled by the lithology, sedimentary facies and diagenesis. The reservoir properties of unequal grains and fine conglomerates, distributary channel and estuary dam microfacies are better. Compaction and cementation have worsen the reservoir properties, whereas dissolution and fracture have improved the reservoir properties.

Key words: reservoir properties, influencing factor, pore structure, pore type, Lulehe Formation, Kunbei oilfield

CLC Number:

TE122.2

WANG Hongmin, DAN Mengqian, WANG Chunping, ZANG Xinxin, CHEN Jinghua, GUO Delong. Reservoir Pore Structure and Property Characteristics of Lulehe Formation in the Q6 Area, Kunbei Oilfield[J]. Geoscience, 2019, 33(06): 1199-1207.

Figures/Tables 8

Fig.1 Structural location of the study area

Fig.2 Macroscopic and microscopic rock characteristics of Lulehe Formation in Q6 area

Fig.3 Triangulation of sandstone components of Lulehe Formation in Q6 area

Fig.4 Distribution frequency of pore diameter (n=26)

Fig.5 Typical tube pressure curve in Q6 area

Fig.6 Reservoir physical characteristics of Lulehe Formation in Q6 area

Fig.7 Reservoir property relationship of different lithologies and facies

Fig.8 Relationship between compaction, cementation and reservoir properties of Lulehe Formation in Q6 area

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