THE SOURCE ROCKS OF HONGSHUIZHUANG FORMATION IN LINGYUAN AREA OF LIAOXI DEPRESSION: Petroleum Geology and Hydrocarbon Generation Potential
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摘要:
洪水庄组页岩是燕辽裂陷带的主力烃源岩层，具有较好的生烃潜力，而辽西拗陷的洪水庄组研究相对薄弱，对烃源岩发育特征和生烃潜力等问题研究不够深入，制约了该区中—新元古界油气地质条件研究和勘探部署工作. 为揭示辽西拗陷洪水庄组烃源岩生烃潜力和油气保存条件，以辽西拗陷凌源地区辽凌地2井和3条剖面的洪水庄组样品为对象，进行了烃源岩地球化学特征分析研究. 结果表明：辽西拗陷凌源地区中元古界洪水庄组烃源岩有机质丰度较高，具有较好的生烃物质基础；有机质类型主要为Ⅰ—Ⅱ1型，局部含Ⅱ2和Ⅲ型；等效镜质体反射率Ro分布在1.15%~2.26%，处于成熟—高成熟阶段，部分样品过成熟，综合评价为中到好烃源岩，生烃潜力较好. 凌源地区以洪水庄组为生油层，可构成2套完整的生储盖组合，且处于有利储集相带，显示出良好的油气勘探前景.
Abstract:The shale of Hongshuizhuang Formation is the dominant source rock of Yanliao rift belt with good hydrocarbon generation potential. However, the study of Hongshuizhuang Formation in Liaoxi Depression is relatively weak, which restricts the study of Meso-Neoproterozoic oil-gas geological conditions and exploration in this area. To reveal the hydrocarbon generation potential and oil-gas preservation conditions of source rocks in the area, geochemical analysis is carried out for samples from LLD2 well and 3 sections in Lingyuan area. The results show that the source rocks of Mesoproterozoic Hongshuizhuang Formation generally have high organic abundance and good hydrocarbon-generating material basis. The organic matter is mainly Ⅰ-Ⅱ1 type, partly Ⅱ2 and Ⅲ types. The Ro distribution ranges from 1.15% to 2.26%, belonging to mature-high mature stage, and some samples are over-mature, which are comprehensively evaluated as medium-good source rocks with good hydrocarbon generation potential. The Hongshuizhuang Formation in Lingyuan area serves as source bed located in favorable reservoir facies belt and can compose two sets of complete source-reservoir-cap assemblages, showing good oil-gas exploration prospects.
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Key words:
- Mesoproterozoic /
- Hongshuizhuang Formation /
- source rock /
- geochemistry /
- Liaoxi Depression
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表 1 取样剖面/钻孔基本信息表
Table 1. Basic information of sampled section/borehole
剖面/钻孔名称 代号 总长度/m 目的层 目的层厚度/m 暗色烃源岩层数 烃源岩累计厚度/m 孟家窝铺剖面 P1701 570 洪水庄组 210 6 96.6 侯杖子南剖面 P1702 460 洪水庄组 70.52 1 41.42 老庄户剖面 LP11 1532 洪水庄组 141.3 3 85.1 辽凌地2井 LLD2 978.9 洪水庄组 114.7 7 78.2 
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表 2 华北地区泥岩有机质丰度评价标准
Table 2. Evaluation criteria for organic matter abundance of mudstone in North China
评价参数 分级评价标准 非烃源岩 差烃源岩 较好烃源岩 好烃源岩 优质烃源岩 TOC/% < 0.5 0.5~1.0 1.0~3.0 3.0~5.0 > 5.0 氯仿沥青“A”/% < 0.01 0.01~0.05 0.05~0.10 0.10~0.20 > 20.0 （S1+S2）/10-3 < 0.5 0.5~2.5 2.5~6.0 6.0~20.0 > 20.0 总烃/10-6 < 100 100~250 250~500 500~1000 > 1000
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表 3 凌源地区洪水庄组烃源岩有机质丰度参数
Table 3. Organic matter abundance parameters of the source rocks from Hongshuizhuang Formation in Lingyuan area
剖面/井 TOC/% 氯仿沥青“A”/% （S1+S2）/10-3 总烃/10-6 范围 均值 范围 均值 范围 均值 范围 均值 P1701 0.59~2.00 1.35 0.0025~0.0081 0.0043 0.02~0.08 0.05 7.24~27.50 18.63 P1702 0.38~1.56 0.79 0.0035 0.0035 0.08~0.18 0.14 9.89 9.89 LP11 0.35~2.65 1.35 0.0172~0.0677 0.0333 0.48~8.37 2.8 86.44~423.40 176.2 LLD2 0.16~5.42 2.14 0.0044~0.2556 0.0229 0.03~1.08 0.52 16.07~730.29 96.35
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表 4 陆相烃源岩成熟阶段划分标准
Table 4. Classification standards for mature stages of continental source rocks
演化阶段 镜质组反射率Ro/% 孢粉颜色指数（SCI） 岩石热解最高峰温Tmax/℃ 原子比（H/C） 孢子体显微荧光（Q） 孢粉（干酪根）颜色 生物标志物 时间-温度指数 古地温T/℃ 油气性质及产状 参数1 参数2 未成熟阶段 < 0.5 < 2.0 < 435 > 1.6 1~1.4 浅黄色 < 0.2 < 0.2 < 15 50~60 生物甲烷，未成熟油、凝析油 低成熟阶段 0.5~0.7 2.0~3.0 435~440 1.2~1.6 1.4~2.0 黄色 0.2~0.4 0.2~0.4 15~75 60~90 低成熟，重质油、凝析油 成熟阶段 0.7~1.3 3.0~4.5 440~450 1.0~1.2 2.0~3.0 深黄色 > 0.4 > 0.4 75~160 90~150 成熟，中质油 高成熟阶段 1.3~2.0 4.5~6.0 450~580 0.5~1.0 > 3.0 浅棕色-棕黑色 — — 160~1500 150~200 高熟，轻质油、凝析油、干气 过成熟阶段 > 2.0 > 6.0 > 580 黑色 — — > 1500 > 200 干气 参数1为ααα-C29-20S/（20S+20R），参数2为C29-ββ/（ββ+αα）.
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