Quantitative Characterization of Fault Sealing and Its Control on Hydrocarbon Accumulation

doi:10.11885/j.issn.1674-5086.2017.03.31.03

Abstract

Abstract: To understand the differences in hydrocarbon accumulation between the lateral and vertical directions of the three fault blocks in eastern LD21 Oilfield, this study established a chart for determining the relationship among embedded depth-shale volume fraction-displacement pressures on the basis of the fault sealing mechanism. The shale volume fraction in fault rocks and reservoir rocks was calculated, and the influence of the compaction diagenetic pressure and time of the displacement pressure of the fault rock were analyzed. The sealing capability of a fault was quantitatively evaluated by calculating the difference in fault-reservoir displacement pressure. The maximum height of the hydrocarbon column height that can be enclosed in different oil-forming faults was predicted, which agrees well with the hydrocarbon column height of various oil fractions in the actual drilling of oilfields, with an average error of 9.5%. This proves the feasibility of this quantitative evaluation of the fault sealing capability, and elucidates the causes of the difference in hydrocarbon accumulation in the lateral and vertical directions. In addition, the orthogonal experiment was performed to quantitatively evaluate selected factors that could affect the displacement pressure of fault rocks. The four factors of fault depth, shale volume fraction, fault dip angle, and effect-time ratio were ranked according to their importance.

Key words: fault sealing, fault-reservoir displacement pressure difference, hydrocarbon accumulation, orthogonal experiment design, quantitative evaluation

CLC Number:

TE122

LI Qiang, TIAN Xiaoping, HE Jing, JIA Haisong, ZHANG Guokun. Quantitative Characterization of Fault Sealing and Its Control on Hydrocarbon Accumulation[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 40-50.

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