HETEROGENEITY EVALUATION OF SHALE IN THE FIRST MEMBER OF QINGSHANKOU FORMATION IN CHANGLING SAG, SONGLIAO BASIN: A Case Study of JYY1 Well
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摘要:
泥页岩评价是油气地球化学研究的重要内容，是了解油气资源潜力的基础.以长岭凹陷吉页油1井青一段泥页岩为研究对象，在对其有机质丰度、有机质类型及成熟度等特征分析研究的基础上，结合测井曲线，对其非均质性进行刻画描述和分级评价.得到认识如下：1）泥页岩以Ⅰ型、Ⅱ型干酪根为主，成熟度处于低成熟-成熟阶段；2）建立了非均质性刻画模型，并对泥页岩进行了分级评价，青一段暗色泥页岩以Ⅱ级资源为主，部分为Ⅰ级资源，Ⅲ级资源较少，青一上段烃源岩整体资源级别要优于青一下段.
Abstract:Shale evaluation is an important part of oil-gas geochemistry research and the basis for understanding potential of oil-gas resources. Taking the shale in the first member of Qingshankou Formation in JYY1 well in Changling Sag as object, the paper evaluates the heterogeneity on the basis of organic characteristics and well logging curves. It is considered that the shale mainly belongs to Types Ⅰ and Ⅱ of kerogens, in low mature-mature stage. The characterization model of reservoir heterogeneity and grading evaluation of shale show that the dark shale in the first member of Qingshankou Formation is mainly Level-Ⅱ resource, partly Level-Ⅰ and a little Level-Ⅲ, and the overall resource level of source rocks in the upper member is better than that in the lower member of Qingshankou Formation.
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表 1 吉页油1井青一段烃源岩有机质丰度统计表
Table 1. Organic matter abundance of K2qn1 source rock from JYY1 well
层位 深度/m TOC/% S1/10-3 氯仿沥青“A”/% （S1+S2）/10-3 青一上段 2470以上 $\frac{{{\rm{0}}{\rm{.33}} \sim {\rm{5}}{\rm{.1}}}}{{{\rm{1}}{\rm{.71(101)}}}}$ $\frac{{{\rm{0}}{\rm{.16}} \sim {\rm{3}}{\rm{.39}}}}{{{\rm{1}}{\rm{.59(101)}}}}$ $\frac{{{\rm{0}}{\rm{.05}} \sim {\rm{1}}{\rm{.08}}}}{{{\rm{0}}{\rm{.51(48)}}}}$ $\frac{{{\rm{0}}{\rm{.87}} \sim {\rm{17}}{\rm{.49}}}}{{{\rm{8}}{\rm{.85(101)}}}}$ 青一下段 2470以下 $\frac{{{\rm{0}}{\rm{.21}} \sim {\rm{3}}{\rm{.08}}}}{{{\rm{1}}{\rm{.18(78)}}}}$ $\frac{{{\rm{0}}{\rm{.08}} \sim {\rm{2}}{\rm{.18}}}}{{{\rm{0}}{\rm{.84(65)}}}}$ $\frac{{{\rm{0}}{\rm{.03}} \sim {\rm{2}}{\rm{.40}}}}{{{\rm{0}}{\rm{.47(44)}}}}$ $\frac{{{\rm{0}}{\rm{.50}} \sim {\rm{16}}{\rm{.61}}}}{{{\rm{4}}{\rm{.93(65)}}}}$ 
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表 2 吉页油1井青一段泥页岩分级评价数据表
Table 2. Grading evaluation of shale in K2qn1 from JYY1 well
烃源岩级别 层位 深度/m 泥页岩总厚度/m TOC/% S1/10-3 氯仿沥青“A”/% 最小连续厚度/m 最大连续厚度/m 泥页岩累计厚度/m 占比/% Ⅰ 青一上段 2414~2470 46 >2.0 >2.0 >0.4 0.25 6.06 18.74 23.99 20.82 26.65 青一下段 2470~2525 44 0.25 1.5 5.25 5.83 Ⅱ 青一上段 2414~2470 46 1.0~2.0 0.5~2.0 0.1~0.4 0.25 4 24.76 48.01 27.51 53.34 青一下段 2470~2525 44 0.19 4.75 23.25 25.83 Ⅲ 青一上段 2414~2470 46 0.5~1.0 < 0.5 < 0.1 0.12 0.87 6.55 13.78 7.28 15.31 青一下段 2470~-2525 44 0.12 0.81 7.23 8.03
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