准噶尔盆地阜康凹陷芦草沟组烃源岩地球化学特征与生烃潜力研究

刘超威; 尤新才; 李辉; 李树博; 陈洪; 王泽胜; 陈梦娜; 李宗浩

doi:10.11781/sysydz202302338

准噶尔盆地阜康凹陷芦草沟组烃源岩地球化学特征与生烃潜力研究

doi: 10.11781/sysydz202302338

中国石油新疆油田公司勘探开发研究院, 新疆克拉玛依 834000

基金项目:

中国石油股份有限公司前瞻性基础性技术攻关项目 2021DJ0405

中国石油股份有限公司前瞻性基础性技术攻关项目 2022DJ0108

详细信息

作者简介:
刘超威(1990-), 男, 硕士, 高级工程师, 从事油气地质综合研究。E-mail: fclcw@petrochina.com.cn

中图分类号: TE122.113
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出版历程
- 收稿日期: 2022-07-13
- 修回日期: 2023-02-22
- 刊出日期: 2023-03-28

Geochemical characteristics and hydrocarbon generation potential of Lucaogou Formation source rocks in Fukang Sag, Junggar Basin

Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

摘要

摘要: 准噶尔盆地阜康凹陷作为盆地内最大的富烃凹陷，其烃源岩地球化学特征、沉积环境和生烃母质等研究不足，限制了对该区探明资源量较低问题的理解。基于阜康凹陷东斜坡新钻揭的烃源岩样品实验分析结果，对阜康凹陷芦草沟组源岩进行了地质地球化学分析研究。阜康凹陷芦草沟组烃源岩总体属于中—很好质量的烃源岩，有机质类型为Ⅱ—Ⅲ型，主体处于低熟—成熟演化阶段；生物标志物特征显示，芦草沟组烃源岩的有机质为陆源高等植物和水生菌藻类的混合，可能具有类杜氏藻的绿藻贡献，总体沉积于贫氧—次富氧、淡水—半咸水的间歇性分层水体环境中，泥岩沉积特征明显。阜康凹陷芦草沟组烃源岩平面上地球化学特征变化较大，阜中凹槽和阜北凹槽显示出更大的生烃潜力。
- 地球化学特征 /
- 生烃母质 /
- 沉积环境 /
- 烃源岩 /
- 芦草沟组 /
- 二叠系 /
- 阜康凹陷 /
- 准噶尔盆地
Abstract: As the largest hydrocarbon-rich sag in the Junggar Basin, the limited research on geochemical characteristics, sedimentary environment and bio-precursors of source rocks in the Fukang Sag has seriously restricted the understanding of the poor proven oil and gas resources in the sag. A combined geological and geochemical analysis on the Lucaogou Formation source rocks in the Fukang Sag was conducted based on the experimental analysis results of the newly drilled source rock samples on the Fudong Slope. The results show that the Lucaogou Formation source rocks in the Fukang Sag generally belong to source rocks of medium to very good quality, with organic matter of type Ⅱ to type Ⅲ, and mainly in the thermal maturity of early mature to mature stage. Biomarker characteristics show that the organic matter of Lucaogou Formation source rocks in the Fukang Sag is a mixture of terrestrial higher plants and aquatic algae and bacteria and maybe some Dunaliella-like green algae, which is generally deposited in the anoxic to oxic, fresh to brackish, intermittent stratified water environment, showing obvious mudstone sedimentary characteristics. The geochemical characteristics of the Lucaogou Formation source rocks in the Fukang Sag vary greatly on the plane, among which, the central and northern subsags show great hydrocarbon generation potential.
- geochemical characteristics /
- bio-precursors /
- sedimentary environment /
- source rock /
- Lucaogou Formation /
- Permian /
- Fukang Sag /
- Junggar Basin

HTML全文

图 1 准噶尔盆地阜康凹陷位置及采样井位分布

Figure 1. Location and sampled well distribution of Fukang Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 2 准噶尔盆地阜康凹陷二叠系芦草沟组烃源岩地球化学特征

T_max去除了小于400 ℃的数据，I_H、PG/ω(TOC)、S₁/ω(TOC)计算时去除了TOC小于0.5%的数据

Figure 2. Geochemical characteristics of Lucaogou Formation source rocks in Fukang Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 3 准噶尔盆地阜康凹陷二叠系芦草沟组烃源岩地球化学特征垂向分布

紫色圆圈是5口井深度和T_max的平均值，紫色线为误差范围；I_H、PG/ω(TOC)、S₁/ω(TOC)计算时去除了TOC小于0.5%的数据；R²为T_max与埋藏深度的相关系数

Figure 3. Vertical distribution of geochemical characteristics of Lucaogou Formation source rocks in Fukang Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 4 准噶尔盆地阜康凹陷二叠系芦草沟组烃源岩与有机质来源相关的生物标志物特征

Figure 4. Biomarker characteristics associated with the source of organic matter of Lucaogou Formation source rocks in Fukang Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 5 准噶尔盆地阜康凹陷二叠系芦草沟组烃源岩与沉积环境相关的生物标志物特征

Figure 5. Biomarker characteristics associated with the sedimentary environment of Lucaogou Formation source rocks in Fukang Sag, Junggar Basin

下载: 全尺寸图片幻灯片

表 1 准噶尔盆地阜康凹陷东部3个凹槽区二叠系芦草沟组烃源岩地球化学分析数据

Table 1. Geochemical analysis data of Lucaogou Formation source rocks in three subsags of the east Fukang Sag, Junggar Basin

样品来源	样品数/ 个	ω(TOC)/%	PG/(mg·g^-1)	T_max/℃	I_H/(mg·g^-1)	PG/ω(TOC)/ (mg·g^-1)	S₁/ω(TOC)/ (mg·g^-1)
阜康凹陷	52	$\frac{0.15 \sim 16.80}{2.33(3.02)} $	$ \frac{0.14 \sim 44.66}{5.80(5.80)}$	$\frac{418 \sim 483}{446(16.26)} $	$\frac{15.87 \sim 431.25}{173.49(100.37)} $	$\frac{22.22 \sim 530.00}{232.24(123.85)} $	$\frac{6.35 \sim 145.00}{52.45(39.63)} $
阜北凹槽	4	$\frac{0.88 \sim 3.76}{2.62(1.07)} $	$\frac{0.88 \sim 9.74}{6.71(3.54)} $	$\frac{439 \sim 480}{454(18.46)} $	$\frac{73.86 \sim 194.60}{149.82(45.48)} $	$\frac{100.00 \sim 309.21}{228.28(77.71)} $	$\frac{26.14 \sim 114.60}{78.46(32.32)} $
阜中凹槽	27	$\frac{0.15 \sim 16.80}{3.64(3.68)} $	$\frac{0.16 \sim 44.66}{9.13(9.79)} $	$\frac{428 \sim 483}{451(15.47)} $	$\frac{50.76 \sim 392.40}{191.18(80.34)} $	$\frac{58.33 \sim 422.80}{247.28(99.62)} $	$\frac{7.58 \sim 141.79}{56.11(37.94)} $
阜南凹槽	21	$\frac{0.24 \sim 2.24}{0.67(0.48)} $	$\frac{0.14 \sim 11.50}{1.37(2.35)} $	$\frac{418 \sim 455}{435(10.66)} $	$\frac{15.87 \sim 431.25}{148.14(133.51)} $	$\frac{22.22 \sim 530.00}{200.87(170.43)} $	$\frac{6.35 \sim 145.00}{35.01(38.32)} $
注：表中分式意义为$\frac{\text { 最小值 ~ 最大值 }}{\text { 平均值(标准差) }} $；T_max统计去除了小于400 ℃的数据，I_H、PG/ω(TOC)、S₁/ω(TOC)计算时去除了TOC小于0.5%的数据。

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