断层封闭性定量表征及对油气富集的控制作用

doi:10.11885/j.issn.1674-5086.2017.03.31.03

摘要/Abstract

摘要： 为了厘清LD21油田东盘3个断块平面上、垂向上油气差异富集的原因，从断层封闭的机理入手，建立了工区的埋深泥质体积分数排替压力关系图版，求取了断层岩和储层的泥质体积分数；剖析了压实成岩压力和压实成岩时间对断层岩排替压力的影响，通过计算断-储排替压力差，定量评价了断层的封闭能力；预测了不同油组断层所能封闭的最大油气柱高度，与工区实钻井各油组油气柱高度吻合度高，平均误差9.5%，证实了此断层封闭能力定量评价方法的可行性，最终明确了平面上、垂向上油气差异富集的原因。此外，采用正交试验设计的方法对优选的影响断层岩排替压力因素进行了定量评价，给出了断层埋深、泥质体积分数、断层倾角和作用时间比四因素的显著性排序。

关键词: 断层封闭性, 断储排替压力差, 油气富集, 正交试验设计, 定量评价

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

中图分类号:

TE122

李强, 田晓平, 何京, 贾海松, 张国坤. 断层封闭性定量表征及对油气富集的控制作用[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 40-50.

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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