摘要:
烃源岩是油气勘探研究的基础,正确的评价烃源岩、划分有利勘探区是做出下一步勘探决策的重要依据.目前对于烃源岩的研究仍以地球化学手段为主,通过对岩心样品的分析虽然可以提供准确的烃源岩地球化学指标,但是往往会受到样品数量以及实验分析费用的限制,很难得到单井上连续的地球化学分析数据;此外,烃源岩具有非均值性,简单的地球化学分析数据的均值化处理将导致优质烃源岩信息受到压制,难以满足勘探精度. 测井信息具有纵向分辨率高且数据连续、准确的特点,加之烃源岩在测井曲线上的特殊响应特征,利用测井信息评价烃源岩为烃源岩的正确评价提供了一种新的方法. 煤系烃源岩岩性差异明显,按照有机质丰度可划分为泥岩、碳质泥岩和煤岩,它们在测井曲线上有着各自的响应特征. 通过对国内外学者已有研究成果的充分调研,基于煤系烃源岩在自然伽马、电阻率、声波时差、中子、密度等测井信息上的响应特征,开展煤系烃源岩定性识别和定量评价;分别对煤系烃源岩的定性识别和有机碳的定量计算方法进行了介绍,并将有机碳的定量计算方法应用到具体实例中,获得了煤系烃源岩TOC参数,取得了较好的效果,可为后续煤系烃源岩的综合评价提供参考.
Abstract:
Hydrocarbon source rock is the foundation of oil and gas exploration research. Proper evaluation of source rocks and divided favorable exploration area play an important role in decision making for further exploration. At present, geochemical methods ( Through analysis of the core samples it can provide accurate geochemical indicators about hydrocarbon source rock) still the main means for hy-drocarbon source rock studies, which is hard to obtain a continuous data on a single well owing to the limited samples and experimental fees. In addition, source rocks have a non-mean, and by making the data from geochemical analysis simply mean treatment will lead to the information from high-quality source rocks to be suppressed, which leads to the exploration precision is difficult to meet. Logging in-formation has a high vertical resolution and the data continuously, accurately the logging characteristics of hydrocarbon source rocks in coal measures all which provides a new approach in the correct evaluation for hydrocarbon source rocks. Coal source rock significantly different, according to the abundance of organic matter can be divided into shale, carbonaceous shale and coal, they have their own characteristics in response on the logs. Making full investigation for the existing research results which created by domestic and foreign scholars. And based on response characteristics of coal source rocks in the natural gamma, resistivity, acoustic time, neutron, density logging information, to carry out a qualitative identification and quantitative evaluation for hydrocarbon source rocks. Quantitative evalu-ation and qualitative identification methods of hydrocarbon source rocks in coal measures were introduced, such as crossplots method,ΔlogR method and the like. Received the data of tatal oxygen carbon by using the methods above, and achieved good results, which provide reference for comprehensive evaluation of hydrocarbon source rocks.