古龙地区青山口组细粒沉积旋回及非均质性

发布时间：2018-02-03 23:09

本文关键词： 细粒沉积岩旋回划分岩相分形非均质性　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来常规油气勘探发现越来越少,促使广大地质工作者转变目标。细粒沉积岩占地壳的2/3左右,成为常规油气勘探的重要接替。但目前对于细粒沉积岩的旋回划分存在很大的随意性,非均质性研究也有一定的难度。古龙凹陷青山口组一段已成为重要的非常规油气勘探层位,其中发育的暗色泥岩不仅可作为良好的烃源岩为传统的储层提供油气,而且由于暗色泥岩厚度大、有机质丰度高、类型好,其本身就具有重要的勘探价值。本次以古龙凹陷青山口组为例(重点研究青山口组一段),总结前人的研究成果,利用测井曲线资料和小波变换方法对细粒沉积岩旋回进行了识别和划分。并且对研究区典型井进行了连续的取样分析,明确了不同旋回内沉积环境演化规律。同时按照“有机质丰度-岩石沉积构造-矿物组成”三级标准,提出了适用于本区新的岩相分类方案。明确了研究区青一段垂向岩相充填序列和平面上的岩相分布规律。为了评价储层的非均质性,从有机非均质性和沉积非均质性2个方面评价青一段SSC1-SSC3层平面非均质性。从烃源岩品质、储集层品质和工程品质3个方面评价青一段垂相非均质性。并且通过试油统计法,明确了含油性的控制因素。研究表明,古龙凹陷青一段平面非均质性及垂相非均质性整体较强。不同岩相在电性、物性、含油性、力学性质上有很大差异。控制SSC1层平面含油性的主要因素是TOC平均值、盒维数模型的维数Bd和幂律模型的拐点及维数2。控制SSC2层平面含油性的因素是TOC平均值、变异系数、幂律模型的拐点和重标极差模型的Hurst指数。控制SSC3层平面含油性的因素是TOC平均值、变异系数、幂律模型的拐点及维数2。控制整个青一段平面含油性的主要因素是非泥质层层数及累计厚度。岩相、TOC、各向异性指数和脆性指数四个条件是影响储集层垂相含油性的重要因素,为后续新井钻探和老井复查提供了依据。在这一过程中利用到了△log R法、单分形、多维分形和测井建模等方法,为泥页岩储层非均质性的研究提供了新的思路。
[Abstract]:In recent years, less and less conventional oil and gas exploration has been discovered, which has prompted geologists to change their targets. The area of fine-grained sedimentary rocks covers about 2/3 of the crust. It has become an important replacement for conventional oil and gas exploration, but at present, there is a great arbitrariness in the cyclological division of fine-grained sedimentary rocks. The first member of Qingshankou formation in Gulong sag has become an important unconventional oil and gas exploration horizon. The developed dark mudstone can not only provide oil and gas for the traditional reservoir as a good source rock, but also have high organic matter abundance and good type because of the large thickness of dark mudstone. This paper takes Qingshankou formation in Gulong sag as an example (focus on Qingshankou formation) and summarizes the previous research results. Using logging curve data and wavelet transform method, the fine grain sedimentary rock cycles are identified and divided, and the typical wells in the study area are continuously sampled and analyzed. The evolution law of sedimentary environment in different cycles is defined. At the same time, according to the "organic matter abundance-rock sedimentary tectonic-mineral composition" level. A new lithofacies classification scheme suitable for this area is put forward. The vertical lithofacies filling sequence and the lithofacies distribution on the plane of Qingyi member in the study area are defined in order to evaluate the heterogeneity of reservoir. From the organic heterogeneity and sedimentary heterogeneity, the paper evaluates the horizontal heterogeneity of the SSC1-SSC3 layer in the first member of Qinghai province. The quality of the source rock is also discussed in terms of the organic heterogeneity and the sedimentary heterogeneity. Reservoir quality and engineering quality were used to evaluate the vertical heterogeneity of the first section of Qinghai province. The controlling factors of oil content were determined by the method of oil test statistics. The horizontal heterogeneity and vertical heterogeneity of Qingyi member in Gulong sag are strong as a whole. The different lithofacies are electric, physical and oily. The main factor controlling the oil content of SSC1 layer is the average value of TOC. The dimension B d of the box dimension model and the inflexion point and dimension of the power law model are 2. The factors controlling the oil content in the plane of SSC2 layer are the TOC mean value and coefficient of variation. The inflection point of the power law model and the Hurst exponent of the rescaled range model. The factors controlling the oil content in the plane of the SSC3 layer are the average value of TOC and the coefficient of variation. The inflection point and dimension of the power law model 2. The main factors controlling the oil content in the whole plane of the first section of Qinghai province are the non-muddy layer number and the cumulative thickness, and the lithofacies TOC. The anisotropy index and brittleness index are the important factors that affect the oil content of the reservoir vertical phase, which provides the basis for the subsequent drilling of new wells and the re-examination of old wells. In this process, the log R method is used. Single fractal, multidimensional fractal and logging modeling provide new ideas for the study of shale reservoir heterogeneity.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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