断层侧向封闭性泥质含量法及其应用中存在问题分析

发布时间：2018-01-03 06:04

本文关键词：断层侧向封闭性泥质含量法及其应用中存在问题分析　出处：《东北石油大学》2017年博士论文　论文类型：学位论文

【摘要】：根据断层侧向封闭机理可知,断层能否侧向遮挡油气,主要取决于断层岩泥质含量的多少。截止到目前,关于断层侧向封闭能力的定量评价方法主要是断层泥比率法(SGR),该算法综合考虑了各种地质因素,进而能够更真实地反映断层岩的泥质含量。在利用断层岩泥质含量(SGR)评价断层侧向封闭性时,应根据研究区内不同地质条件,而采用相应断层侧向封闭能力评价方法,主要可分为三类:(1)在研究区无已知油水界面断圈的地质条件下,建立了断层岩泥质含量下限(SGRllt)法,来评价研究区内断层侧向封闭油气的能力;(2)在研究区内存在一个或少量已知油水界面断圈的地质条件下,建立了改进后的Yielding断层岩泥质含量预测油柱高度法(SGRllt~H),来评价研究区内断层侧向封闭油气的能力;(3)在研究区存在多个或大量已知油水界面断圈的地质条件下,建立了断层岩泥质含量~油气柱高度关系统计法,来评价研究区内断层侧向封闭油气的能力。应用上述三种不同的断层岩泥质含量法对束鹿西斜坡、文安斜坡、渤中28-2S/N和渤中34-1/N地区断层侧向封闭性进行评价,存在个别断圈侧向封闭油气的能力与油气的实际分布呈不吻合现象。造成这种现象的因素主要有两种:(1)油气成藏期断层古侧向封闭能力弱造成断圈钻井失利:针对这种情况,通过恢复油气成藏期古地层厚度、古断距大小、以及断移地层内古泥质含量,结合断层岩泥质含量SGR算法,便可建立一套油气成藏期断层古侧向封闭能力恢复方法。并利用该方法对文13断圈的古侧向封闭能力进行定量评价,其预测结果与文13井含油气性相吻合,证明了该方法用于定量评价断层古侧向封闭性是可行的;(2)断层后期活动造成断圈钻井失利:针对这种情况,通过恢复油气成藏期之后断层活动速率,来反映断层后期活动对早期形成的封闭断层的破坏作用。并通过对比齐家-鸳鸯沟地区锦24和锦33断圈油气成藏期之后控圈断层活动速率大小,结果表明锦24断圈的控圈断层F2成藏期后活动强度明显大于锦33断层圈闭处断裂活动强度,使其实际封油气能力范围变小,造成锦24断层圈闭内钻井失利。
[Abstract]:According to the mechanism of fault lateral sealing, whether the fault can block oil and gas laterally depends mainly on the content of fault gouge. Up to now. The quantitative evaluation method of fault lateral sealing ability is mainly fault gouge ratio method (SGRN), which considers all kinds of geological factors synthetically. In order to reflect the gouty content of fault rock more truthfully, different geological conditions should be taken into account in evaluating fault lateral sealing by using fault rock gouty content and SGR. The evaluation method of the lateral sealing ability of the corresponding faults can be divided into three types: 1) under the geological conditions of no known oil-water interface fault circle in the study area. The lower limit of shale content in fault rock is established to evaluate the ability of lateral sealing of oil and gas from faults in the study area. 2) under the geological condition of one or a little known oil-water interfacial fault zone in the study area, an improved method of predicting the oil column height of Yielding fault mudstone has been established. To evaluate the ability of fault lateral sealing oil and gas in the study area; 3) under the geological conditions where there are many or a large number of known oil-water interfacial fault zones in the study area, a statistical method for the relationship between the shale content of fault rock and the height of oil and gas column is established. To evaluate the ability of fault lateral sealing oil and gas in the study area. Using the above three different fault shale content method to the West Slope of Shulu, Wenan Slope. The lateral sealing of faults in the area of 28-2S / N and 34-1 / N in Bozhong is evaluated. The ability of lateral sealing of oil and gas in some fault circles does not coincide with the actual distribution of oil and gas. There are two main factors that cause this phenomenon. Weak paleo-lateral sealing ability of faults in oil-gas accumulation period resulted in failure of fault-ring drilling: in view of this situation. By restoring paleostratigraphic thickness, paleo-fault distance and paleo-argillaceous content in faulted strata during hydrocarbon accumulation period, combined with SGR algorithm of fault mudstone content. The method can be used to quantitatively evaluate the paleo-lateral sealing ability of fault in Wen13 fault circle, and the prediction results are in agreement with the petroliferous property of well Wen13. It is proved that this method is feasible for quantitative evaluation of paleo-lateral sealing of faults. 2) failure of fault circle drilling due to late fault activity: in view of this situation, fault activity rate after oil and gas accumulation period is restored. To reflect the failure of the late fault activity to the early formation of the closed fault, and through the comparison of Jijia-Yuanyanggou area, Jin24 and Jin33 fault cycle oil and gas accumulation period after the control fault activity rate. The results show that the activity intensity of the fault F2 in the Jin24 fault circle is obviously greater than that in the fault trap of Jin33, which makes the range of actual sealing ability of oil and gas become smaller. The failure of drilling in Jin24 fault trap was caused.
【学位授予单位】：东北石油大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：P618.13

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