摘要
为分析准南天山山前冲断带东南侧芦草沟组上段油页岩资源潜力、沉积时的古环境特征及其垂向演化规律,并预测优质油页岩发育层位,研究采用有机地球化学方法,对准页3井油页岩进行了TOC测试、抽提、族组分分析和气相色谱-质谱(GC-MS)分析。分析结果表明:油页岩样品w(TOC)平均为3.26%,最大值为6.30%,最小值为0.82%。可溶有机质质量分数平均为0.21%,最大值为0.65%,最小值为0.01%。总烃(HC)质量分数平均为1 120.58×10^(-6),最大值为3 561.84×10^(-6),最小值为42.92×10^(-6)。油页岩有机质整体丰度较好,具有极好的生烃潜力,650～1 100 m层段为优质油页岩发育富集层。饱和烃质量分数平均为24.04%,最大值为65.73%,最小值为3.03%。芳烃质量分数平均为23.88%,最大值为39.46%,最小值为11.24%。胶质沥青质质量分数平均为52.08%,最大值78.45%,最小值22.06%。CPI最小值1.12,最大值4.12;轻重比指数最小值0.73,最大值1.45;OEP最小值0.98,最大值1.16。结合C_(27)ααα20R、C_(28)ααα20R、C_(29)ααα20R 3个"生物构型甾烷"的相对含量说明,有机质类型以腐植-腐泥型为主,母质来源以藻类、浮游生物为主。R_o、Ts/Tm、C_(29)ββ/(C_(29)αα+C_(29)ββ)与C_(29)αααS/(S+R)关系表明油页岩处于未成熟晚期-低成熟阶段。Pr、Ph和C_(17)、C_(18)正构烷烃的相对含量表明油页岩上部和下部沉积古环境为较开阔的海相咸水还原环境,中部为封闭的湖相半咸水过渡环境。油页岩具有分段性特征,其石油地质与沉积环境特征各不相同,优质油页岩发育于第二层段,为勘探和开采最优层段。
Oil shale is well developed in Lucaogou Formation(P2l) in the Tianshan thrust belt of the south Junggar Basin. This paper used organic geochemical methods(i.e. TOC test, extraction, group analysis and gas chromatography-mass spectrometry(GC-MS) analysis) to evaluate the hydrocarbon generation potential of the oil shale in the upper member of Lucaogou Formation(P2l2) in Well J3. Biomarker compound parameters were used to analyse the sedimentary environment as well as vertical evolution. Finally, the preferable oil shale development uint was predicted. The content of TOC ranged from 0.82% to 6.30%, with an average of 3.26%. The content of soluble organic matter ranged from 0.01% to 0.65%, with an average of 0.21%. The content of HC ranged from 42.92×10^-6 to 3 561.84×10^-6, averaged at 1 120.58×10^-6. The results show that the samples have high organic abundance and hydrocarbon generation potential. The interval of 650-1 100 m is a high-quality oil shale enrichment section. The content of saturated hydrocarbon ranges from 11.24% to 39.46%, with an average of 23.88%. The content of colloid and asphaltene ranges from 3.03% to 65.73%, averaged at 24.04%. The content of aromatic hydrocarbon ranges from 22.06% to 78.45%, with an average of 52.08%. The CPI index ranges from 1.12 to 4.12 and the light/weight ratio index, from 0.73 to 1.45, and OEP ranges from 0.98 to 1.16. The relative contents of 3 decane(i.e. C27ααα20 R,C28ααα20 R and C29ααα20 R) as well as the data above are used to analyse the source and type of organic matter. Most organic matter comes from algae and plankton, and contains humus-saprolite kerogen. The Ro, Ts/Tm, C29ββ/(C29αα+C29ββ) and C29αααS/(S+R) data show that the organic matter is matured between the late immature stage and the low mature stage. The relative contents of Pr, Ph, C17 and C18 n-alkanes data indicate that 3 uints of studied section can be divided. The sedimentary environments of upper and lower uint are open, marine, brackish, and strong reducing water. While th
作者
柯友亮
王华
甘华军
陈思
刘可行
王思洋
巩天浩
李奔
闫馨友
Ke Youliang;Wang Hua;Gan Huajun;Chen Si;Liu Kexing;Wang Siyang;Gong Tianhao;Li Ben;Yan Xinyou(Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China;Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;Business Unit of Petroleum Exploration,PetroChina Huabei Oilfield Company,Cangzhou Hebei 062552,China)
出处
《地质科技情报》
CAS
CSCD
北大核心
2019年第3期199-207,共9页
Geological Science and Technology Information
基金
国家科技重大专项"深水重力流-扇体沉积模式与储层地质评价"(2017ZX05009-002-003)
