OIL AND GAS EXPLORATION PROSPECT OF HONGMIAOZI FAULT DEPRESSION IN THE SOUTHEASTERN PERIPHERY OF SONGLIAO BASIN: A Case Study of Lower Cretaceous Yingzuilazi Formation in LXD1 well
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摘要:
红庙子断陷位于桓仁盆地北部, 是一东断西超的箕状断陷, 露头及少量钻探揭示其内发育较好的烃源岩条件. 本研究利用该断陷西部辽新地1井的钻探资料, 详细分析了前人研究薄弱的鹰嘴砬子组油气地质条件与成藏前景. 测试分析表明, 红庙子断陷鹰嘴砬子组油气显示较好, 烃源岩以半湖相灰黑色泥岩为主, 有机质丰度较高, 且有机质主体进入成熟生烃阶段, 属中等-好烃源岩. 储层虽以特低孔、低渗型为主, 但其上覆林子头组和下伏果松组均发育安山质火山岩建造储层, 为油气藏形成提供了多套储集空间. 同时, 电法勘探综合解释剖面显示, 烃源岩发育的鹰嘴砬子组不仅夹持在林子头组和果松组2套火山岩建造储层之间, 并直接与果松组火山建造储层对顶相接, 形成了有利的生储盖组合. 推测红庙子断陷具有较好的油气勘探前景.
Abstract:Hongmiaozi fault depression, located in northern Huanren Basin, is a half-graben depression faulted in the east and overlapped in the west. The outcrops and limited drilling work reveal a favorable condition for the formation of source rocks. Based on the drilling data from LXD1 well in the western fault depression, the study analyzes the oil-gas geological conditions and accumulation prospect of Yingzuilazi Formation. Test analysis shows that there is good oil-gas indication in Yingzuilazi Formation, with the source rocks dominated by semi-lacustrine grayish black mudstone, high abundance of organic matter, and the main body of organic matter in mature hydrocarbon generation stage, belonging to medium-good source rocks. Although the reservoirs are mainly of ultra-low porosity and low permeability type, the andesitic volcanic rock formation reservoirs are developed in both the overlying Linzitou Formation and underlying Guosong Formation, which provide multiple reservoir spaces for the formation of oil-gas reservoirs. Besides, the electrical exploration comprehensive interpretation section shows that the Yingzuilazi Formation with developed source rocks is sandwiched between the two volcanic formation reservoirs of Linzitou Formation and Guosong Formation, and directly contacted with the volcanic reservoir roof of Guosong Formation, forming a favorable source-reservoir-cap combination. It is inferred that Hongmiaozi fault depression has a good prospect of oil and gas exploration.
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Key words:
- Lower Cretaceous /
- Yingzuilazi Formation /
- source rock /
- oil-gas resources /
- exploration prospect /
- Songliao Basin
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表 1 辽新地1井天然气成分统计及碳同位素
Table 1. Composition of natural gas and carbon isotopes of LXD1 well
样品编号 O2/% N2/% CO2/% CH4/% 碳同位素（13CH4）/‰ 1 0 6.5 0.32 93.18 -59.9 2 10.33 6.79 1.06 81.82 -60.3 3 7.17 9.61 0.79 82.42 -60.6 4 7.6 5.29 0.3 86.81 -60.4 5 10.27 5.07 0.37 84.3 -60.5 6 8.07 4.38 0.29 87.26 -60.5 
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表 2 辽新地1井鹰嘴砬子组暗色泥岩有机质丰度与峰温参数热解分析结果
Table 2. Organic matter abundance and peak temperature parameter pyrolysis analysis results of dark mudstone in Yingzuilazi Formation of LXD1 well
深度/m 可溶烃（S1）/10-3 热解烃（S2）/10-3 生烃潜量（S1+S2）/10-3 热解峰温（Tmax）/℃ 162.9 0.51 1.42 1.93 454 163.7 0.36 0.59 0.95 453 165.5 0.40 2.12 2.52 461 168.1 0.03 3.27 3.30 459 169.2 0.28 3.44 3.72 458 169.8 0.19 1.58 1.77 460 171.4 0.47 4.56 5.03 463 173.6 0.32 3.43 3.75 465 174.8 0.21 2.75 2.93 461 175.4 0.07 0.55 0.62 461 213.6 0.85 2.44 3.29 455 252.0 0.81 3.39 4.20 461 252.6 0.63 2.72 3.35 455 253.4 0.71 1.76 2.47 462 256.2 0.60 2.24 2.84 466 257.2 0.42 1.11 1.53 463 260.3 0.27 0.49 0.76 460 261.2 0.23 0.66 0.89 459 262.2 0.14 0.25 0.39 458 263.2 0.21 0.78 0.99 457 264.6 0.92 2.32 3.24 461 265.6 0.14 0.44 0.58 464 266.5 1.06 1.89 2.95 464 267.5 1.06 1.40 2.46 466 341.4 0.01 0.20 0.21 467 342.7 0.14 0.52 0.66 468 343.6 0.04 0.42 0.46 464 345.6 0.12 0.87 0.99 466 346.8 0.19 0.71 0.90 463 348.0 0.06 0.31 0.37 464 355.6 0.30 0.74 1.04 470 458.3 0.25 0.65 0.90 466 459.5 0.23 0.71 0.94 469
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表 3 辽新地1井鹰嘴砬子组暗色泥岩有机质类型参数热解分析结果
Table 3. Pyrolysis analysis results of organic matter type parameters of dark mudstone in Yingzuilazi Formation of LXD1 well
深度/m 岩性 样品量/mg 有机碳（TOC）/% 可溶烃（S1）/10-3 热解烃（S2）/10-3 有机CO2（S3）/10-3 生烃潜量（S1+S2）/10-3 氢指数（HI）/10-3 类型指数（TYC） 热解率（D）/% 168.1 灰黑色泥岩 83.5 0.71 0.35 1.33 1.04 1.68 187.00 1.28 19.60 259.2 灰黑色泥岩 78.1 1.24 0.72 1.58 1.17 2.30 128.00 1.35 15.42 264.0 灰黑色泥岩 95.2 1.45 0.91 2.01 0.92 2.92 138.00 2.18 16.69 313.3 灰黑色泥岩 73.9 1.38 0.36 1.42 0.95 1.78 103.00 1.49 10.68 483.5 灰黑色粉砂质泥岩 69.9 1.44 0.70 1.11 0.95 1.81 77.00 1.17 10.47
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