源储一体烃源岩精确评价——以准噶尔盆地吉木萨尔凹陷芦草沟组为例

李二庭; 王剑; 李际; 何丹; 高秀伟; 刘翠敏; 王海静

doi:10.11781/sysydz202102335

源储一体烃源岩精确评价——以准噶尔盆地吉木萨尔凹陷芦草沟组为例

doi: 10.11781/sysydz202102335

李二庭^{1, 2,},
王剑^{1, 2},
李际^{1, 2},
何丹^{1, 2},
高秀伟^{1, 2},
刘翠敏^{1, 2},
王海静^{1, 2}

1.
新疆砾岩油藏实验室, 新疆克拉玛依 834000
2.
中国石油新疆油田分公司实验检测研究院, 新疆克拉玛依 834000

基金项目:

新疆维吾尔自治区岩页油重点实验室开放课题 2017D04023

详细信息

作者简介:
李二庭(1988—), 男, 博士, 高级工程师, 从事油气地球化学研究。E-mail: lierting@petrochina.com.cn

中图分类号: TE122.1
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出版历程
- 收稿日期: 2020-05-14
- 修回日期: 2021-02-02
- 刊出日期: 2021-03-28

Accurate evaluation of source rocks in source-reservoir integration: a case study of source rocks in Lucaogou Formation, Jimsar Sag, Junggar Basin

LI Erting^{1, 2
,},
WANG Jian^{1, 2},
LI Ji^{1, 2},
HE Dan^{1, 2},
GAO Xiuwei^{1, 2},
LIU Cuimin^{1, 2},
WANG Haijing^{1, 2}

1.
Xinjiang Laboratory of Petroleum Reserve in Conglomerate, Karamay, Xinjiang 834000, China
2.
Research Institute of Experiment and Testing, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

摘要

摘要: 准噶尔盆地吉木萨尔凹陷中二叠统芦草沟组源储一体，岩心样品中常见原油浸染现象，导致烃源岩评价参数测定不准。针对这种现象，利用氯仿抽提技术，分析了运移烃类对烃源岩评价结果的影响，细分岩性准确评价了该区芦草沟组源储一体烃源岩的生烃潜力。结果显示：（1）烃源岩中可溶有机质烃类含量越高，会导致烃源岩有机碳测定值偏差越高，热解参数S₁、S₂值增大，T_max值降低，氢指数增大，对于源储一体烃源岩应先进行氯仿抽提，再进行热解分析。（2）吉木萨尔凹陷芦草沟组烃源岩以泥岩类有机质丰度最高，属于好—最好的生油岩，其次为白云岩类，属于好的生油岩，灰岩属于中等—好的生油岩，粉砂岩类主要为差生油岩；烃源岩有机质类型以Ⅰ型、Ⅱ₁型、Ⅱ₂为主，少量Ⅲ型，整体达到成熟大量生油阶段。抽提后的烃源岩有机碳含量、氢指数及T_max值，可有效用于源储一体烃源岩及油浸烃源岩的准确评价。
- 源储一体 /
- 烃源岩评价 /
- 芦草沟组 /
- 中二叠统 /
- 吉木萨尔凹陷 /
- 准噶尔盆地
Abstract: In the Middle Permian Lucaogou Formation in the Jimsar Sag of Junggar Basin, source rocks and reservoirs are integrated. Crude oil impregnation is very common in core samples, which leads to the inaccurate determination of source rock evaluation parameters. The impact of migrated hydrocarbon on source rock evaluation was analyzed using chloroform extraction. The hydrocarbon potential of source rocks which were integrated with reservoirs in the Lucaogou Formation was evaluated accurately in view of different lithologies. The higher the content of soluble hydrocarbons in the source rock, the higher the deviation of the measured value of the source rock's total organic carbon, the higher the pyrolysis parameters S₁ and S₂, the lower the T_max value, and the higher the hydrogen index. For source rocks integrated with reservoirs, chloroform extraction should be performed first, followed by pyrolysis analysis. For the Lucaogou source rocks in the study area, mudstones have the highest abundance of organic matter and comprise the best source rocks, followed by dolomites, which are good source rocks. Limestones are medium-good source rocks, while siltstones are mainly poor source rocks. The organic matter types of source rocks are mainly type Ⅰ, type Ⅱ₁, and type Ⅱ₂, with a small amount of type Ⅲ, which has reached the mature oil production stage. The organic carbon content, hydrogen index, and T_max value of extracted source rocks can be effectively used for the accurate evaluation of the source rocks integrated with reservoirs or impregnated with oil.
- source-reservoir integration /
- source rock evaluation /
- Lucaogou Formation /
- Middle Permian /
- Jimsar Sag /
- Junggar Basin

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图 1 准噶尔盆地吉木萨尔凹陷采样井位分布

Figure 1. Sampling wells in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 2 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩有机碳抽提前、后特征

Figure 2. Organic carbon content changes before and after chloroform extraction of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 3 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩抽提前、后S₁和S₂值特征

Figure 3. S₁ and S₂ changes before and after chloroform extraction of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 4 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩抽提前、后T_max特征

Figure 4. T_max changes before and after chloroform extraction of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 5 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩T_max值与不同性质氯仿沥青“A”含量的关系

Figure 5. Relationship between chloroform bitumen "A" content of different properties and T_max of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 6 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩抽提前、后氢指数特征

Figure 6. Hydrocarbon index changes before and after chloroform extraction of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

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图 7 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩抽提前、后评价参数变化与S₁/w(TOC)的关系

Figure 7. Evaluation parameters vs. S₁/w(TOC) before and after chloroform extraction of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 8 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩有机碳与生烃潜量柱状图

Figure 8. Histograms of organic carbon content and hydrocarbon generation potential of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

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图 9 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩类型

Figure 9. Source rock types of Lucaogou Formation in Jimsar Sag, Junggar Basin

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表 1 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩样品信息

Table 1. Characteristics of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

井号	深度/m	岩性	ω(TOC)/%		氯仿沥青“A”/‰
井号	深度/m	岩性	抽提前	抽提后	氯仿沥青“A”/‰
吉251	3 598.78	褐灰色白云岩	1.55	1.04	0.831 7
吉251	3 601.12	深灰色白云质泥岩	2.23	1.26	2.026 6
吉251	3 602.14	灰色白云质泥岩	7.45	7.14	0.411 4
吉251	3 610.11	深灰色泥质灰岩	1.22	1.18	0.030 8
吉251	3 614.03	深灰色泥质灰岩	1.43	1.40	0.026 7
吉251	3 619.58	深灰色泥岩	3.66	2.40	2.452 2
吉251	3 620.74	深灰色泥岩	4.08	3.88	0.154 6
吉251	3 623.52	灰色白云质粉砂岩	1.34	0.59	1.144 7
吉251	3 624.48	深灰色白云质泥岩	3.36	3.15	0.333 0
吉251	3 631.16	深灰色泥岩	5.60	5.19	0.208 0
吉251	3 635.21	灰黑色灰质白云岩	1.07	1.05	0.032 9
吉251	3 728.54	深灰色泥岩	2.00	1.80	0.205 2
吉251	3 742.64	灰色粉砂岩	2.94	1.06	2.404 8
吉251	3 747.21	灰色泥质粉砂岩	2.59	1.32	1.665 5
吉303	2 576.91	灰色灰质白云岩	0.96	0.58	0.568 8
吉303	2 581.96	灰色白云质泥岩	2.82	1.59	1.816 1
吉303	2 582.92	深灰色白云质泥岩	5.05	3.66	1.835 8
吉303	2 589.30	深灰色白云质泥岩	5.94	5.08	1.180 1
吉303	2 592.16	深灰色泥质白云岩	11.60	10.90	0.772 8
吉303	2 596.48	深灰色泥岩	5.21	4.58	0.764 7
吉305	3 398.38	深灰色泥岩	7.77	6.83	1.221 4
吉305	3 400.01	深灰色泥岩	7.83	6.96	0.786 2
吉305	3 404.48	灰色泥质白云岩	1.58	1.21	0.673 0
吉305	3 414.82	灰色白云质泥岩	7.10	6.82	0.373 4
吉305	3 436.28	灰色灰质粉砂岩	5.98	5.60	0.424 6

下载: 导出CSV

表 2 氯仿沥青“A”含量对准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩热解参数T_max的影响

Table 2. Influence of chloroform bitumen "A" content on T_max of source rocks in Lucaotou Formation, Jimsar Sag, Junggar Basin

实验项目	烃源岩质量/mg	加入氯仿沥青“A”质量/mg	S₁/(mg·g^-1)	S₂/(mg·g^-1)	T_max/℃
烃源岩样品+重质氯仿沥青“A”	50.04	0.00	0.40	2.33	438
	50.03	0.31	2.03	4.18	436
	50.11	0.52	3.09	6.16	433
	50.08	1.04	7.46	11.51	427
	49.97	1.50	9.84	13.92	426
	49.99	2.02	12.64	16.98	424
烃源岩样品+轻质氯仿沥青“A”	50.04	0.00	0.40	2.33	438
	50.06	0.33	2.06	3.31	435
	50.12	0.49	3.59	4.78	434
	50.06	1.04	6.24	7.07	432
	50.16	1.48	8.44	9.24	431
	50.05	1.99	9.94	10.81	430

下载: 导出CSV

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