GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF CRUDE OIL FROM JZ-A STRUCTURE ON THE LIAOXI UPLIFT, BOHAI SEA
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摘要:
通过对辽西凸起锦州A构造沙河街组二段原油的地球化学分析，研究了原油的物性、成熟度和生物标志化合物特征。通过对比辽西凹陷和辽中凹陷已发现典型油气田的原油地球化学特征，结合区域地质背景分析了锦州A构造的油源。研究结果表明，锦州A构造西盘为低蜡、低硫凝析原油，而东盘为高蜡、低硫轻质原油。原油饱和烃色谱完整，显示未遭受明显生物降解。油源母质为混合型，沙河街组二段原油陆源有机质输入较少。原油形成于弱还原—还原条件下的微咸水或咸水沉积环境。根据锦州A构造原油的生物标志物特征，利用聚类分析方法划分为2类原油:Ⅰ类原油表现为高伽马蜡烷指数、低—中等四甲基甾烷指数、低藿烷/甾烷、高C27/C29甾烷和高C28/C29甾烷比值，主要来源于辽西凹陷沙一段烃源岩; Ⅱ类原油表现为低—中等伽马蜡烷指数、中等-高四甲基甾烷指数、高藿烷/甾烷、中等C27/C29甾烷和低C28/C29甾烷比值，主要来源于辽中凹陷沙三段烃源岩。
Abstract:Geochemical analyses of crude oil samples from the 2nd Member of Shahejie Formation of the JZ-A structure on the Liaoxi Uplift were carried out, upon which physical properties, maturities and characteristics of biomarkers of the crude oil were studied. Comparison of geochemical characteristics of the crude oil is conducted for the oil and gas fields discovered in the Liaoxi and Lizhong depressions. The research results show that the crude oil in the western block is dominated by condensate oil with low wax and low sulfur, while the crude oil in the eastern block is characterized by light oil with high wax and low sulfur. The saturated hydrocarbon chromatograms of the crude oil from JZ-A structure show a complete distribution pattern, indicating a lack of biodegradation. The results also show that organic matters in the 2nd Member of Shahejie Formation came from a mixed source with minor terrigenous input of organic matter. Crude oils were formed in a reduction to weak reduction and brackish or saline water environment. Two source-related oil classes are identified by hierarchical cluster analysis according to the biomarkers of the crude oil from JZ-A structure. The Class Ⅰ oil has higher gammacerane index, low-medium 4-methyl sterane indices(4-MSI), low hopane/sterane, high C27/C29 sterane and high C28/C29 sterane, which is most similar with the E2s1 source rock of Liaoxi Depression. However, the Class Ⅱ oil displays low-medium gammacerane index, medium-high 4-MSI, high hopane/sterane, medium C27/C29 sterane and low C28/C29 sterane, mostly similar with the E2s3 source rock of Liaozhong Depression.
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Key words:
- crude oil /
- biomarker /
- oil-source correlation /
- Liaoxi Uprift /
- Bohai Sea
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表 1 辽西凸起锦州A构造原油物性数据
Table 1. Physical property data of crude oils in JZ-A structure, Liaoxi Uplift
井号 层位 深度/m 密度/(g/cm3) 黏度/(mPa·s) 凝固点/℃ 含蜡量/% 含硫量/% JZ-1A E2s2 2 614.6 0.774 2 1.47 0.00 3.48 0.02 JZ-5A E2s2 2 565.3 0.844 2 4.70 23.00 18.63 0.08 
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表 2 辽西凸起锦州A构造原油全烃气相色谱数据
Table 2. Gas chromatography data of crude oils from JZ-A structure, Liaoxi Uplift
井号 层位 深度/m 主峰碳 Pr/Ph >Pr/nC17 Ph/nC18 CPI OEP ΣC21-/ΣC22+ JZ-1A E2s2 2 614.6 19 0.95 0.43 0.39 1.20 1.09 1.61 JZ-3A E2s2 2 572.0 19 0.76 0.44 0.43 1.14 1.08 1.06 JZ-3A E2s2 2 580.7 19 0.95 0.43 0.42 1.11 1.07 1.35 JZ-4A E2s2 2 568.5 19 1.27 0.64 0.62 1.18 0.71 1.56 JZ-5A E2s2 2 565.3 22 0.96 0.43 0.39 1.07 1.05 0.74 JZ-5A E2s2 2 569.5 22 0.63 0.40 0.38 1.07 1.05 0.49
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表 3 辽西凸起锦州A构造原油地球化学参数
Table 3. Geochemical parameters of crude oils from JZ-A structure on the Liaoxi Uplift
井号 样号 井段/m 层位 A* B* C* D* E* F* G* H* I* J* K L M N P JZ-1A 1A 2 614.6 E2s2 0.19 0.47 1.69 0.18 0.56 0.25 0.23 0.62 4.20 0.46 1.23 0.24 0.31 0.41 0.32 JZ-3A 2A 2 572.0 E2s2 0.10 0.33 1.75 0.09 0.51 0.34 0.20 0.45 4.54 0.56 1.71 0.26 0.39 0.51 0.34 JZ-3A 3A 2 580.7 E2s2 0.13 0.36 1.72 0.11 0.47 0.32 0.18 0.38 5.57 0.48 2.23 0.36 0.47 0.77 0.56 JZ-4A 1B 2 569.5 E2s2 0.29 0.45 0.47 0.09 0.52 0.14 0.40 0.55 10.26 0.44 0.97 0.38 0.43 0.71 0.62 JZ-4A 2B 2 568.5 E2s2 0.38 0.52 0.47 0.12 0.53 0.14 0.40 0.55 10.06 0.45 0.94 0.38 0.41 0.64 0.60 JZ-5A 1C 2 565.3 E2s2 0.20 0.36 0.56 0.09 0.49 0.19 0.37 0.42 10.06 0.54 2.47 0.48 0.60 1.55 0.92 JZ-5A 2C 2569.5 E2s2 0.15 0.33 0.54 0.10 0.49 0.18 0.34 0.45 15.07 0.50 2.00 0.38 0.55 1.01 0.62 注：(A)C19 /C23三环萜烷；(B) C20 /C23三环萜烷；(C) C24四环萜烷/C26三环萜烷；(D) C23三环萜烷/αβC30藿烷；(E) ETR(长链三环萜烷比值)；(F)伽马蜡烷/αβC30藿烷；(G) 4-甲基甾烷指数(4-甲基甾烷/ΣC29甾烷)；(H) C27重排胆甾烷/C27胆甾烷；(Ⅰ)藿烷/甾烷；(J) C35升藿烷/C34升藿烷；(K) Ts/Tm；(L) C29 ααS/(S+R)；(M) C29 ββ/(αα+ββ)；(N) C29 ββR/ααR；P: C29 ααS/R
*用于聚类分析的生标参数.
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