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Identification of the lower limit of high-quality source rocks and its relation to hydrocarbon accumulation——Taking the beier sag in the Hailaer Basin as an example

引用

Petroleum Science 2012年第1期9卷 10-17页

作者： Lu Shuangfang Chen Fangwen Li Jijun Wang Weiming Li Huiguang Cao Ruicheng Ma Yanling College of Geosciences Northeast Petroleum UniversityHeilongjiang 163318China Province Key Laboratory of Petroleum Accumulation Mechanism and Resource Prediction Heilongjiang 163318China The Halaer Exploratory Development Headquarters Daqing Oilfield Company Ltd.Heilongjiang 163000China

The theory of ＂source rock control＂ has evolved from source-rock-control hydrocarbon accumulation, to effective source-rock-control hydrocarbon accumulation, and to high-quality source- rock-control hydrocarbon accumulation. However, there are problems, such as whether high-quality source rocks exist or not？ What high-quality source rocks are, and how to identify them, are yet to be agreed upon. Aimed at this issue of concern to explorationists, and taking the beier sag in the Hailaer Basin as an example, this paper defines the high-quality source rocks and the lower limit for evaluation of high-quality source rocks, by using the inflection point on the relationship curve of hydrocarbon （oil） expulsion, which is calculated by the material balance principle, versus total organic carbon （TOC）. The results show that when TOC is low, all source rocks have limited hydrocarbon expulsion and slow growth rate, thus they cannot be high-quality source rocks. However, when TOC rises to some threshold, hydrocarbon expulsion increases significantly with TOC. This inflection point should be the lower limit of high-quality source rocks： those with TOC greater than the inflection-point value are high-quality source rocks. In addition, the lower limit of high-quality source rocks is also related to the type and maturity of organic matters in the source rocks, as well as the mineral components of the source rocks affecting the residual hydrocarbons. Theoretically, the lower limit of high-quality source rocks depends on geological conditions rather than being a constant value. However, for the sake of simplicity and practicability, in this paper TOC=2.0% is regarded as the lower limit of high-quality source rocks. The examination of such standard in the work area indicates that the high-quality source rocks in members K^n2 and K^n~ of the Nantun formation contribute 76% and 82% to oil generation, and 96% and 91% to oil expulsion, respectively. The distribution of high-quality source r

关键词： High-quality source rocks material balance oil generation oil expulsion hydrocarbongeneration potential beier sag

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