煤系烃源岩油气生成、排出与滞留特征

杨恒; 龚文平; 郑伦举

doi:10.11781/sysydz202103498

煤系烃源岩油气生成、排出与滞留特征

doi: 10.11781/sysydz202103498

杨恒^1,,
龚文平¹,
郑伦举^2, ,

1.
长江大学, 武汉 430100
2.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目:

中国石化基础前瞻性研究项目“烃源岩演化机理研究” JC-2020-kt001-12

国家自然科学基金企业创新发展联合基金 U19B6003

详细信息

作者简介:
杨恒(1992-), 男, 硕士, 从事非常规油气研究。E-mail: 751267177@qq.com

通讯作者:
郑伦举(1968-), 男, 研究员, 从事烃源岩地球化学、生排烃机理研究。E-mail: 292002418@qq.com

中图分类号: TE122.1
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-06
- 修回日期: 2021-04-12
- 刊出日期: 2021-05-28

Characteristics of oil and gas generation, expelling and retention of coaly source rock

1.
Yangtze University, Wuhan, Hubei 430100, China
2.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 针对煤系地层烃源岩的油气生成、排出与滞留能力的有效性问题，选取不同沉积环境、不同时代煤岩及其夹层中的碳质泥岩和泥岩，开展了在成岩作用下的高温高压半开放—半封闭体系模拟实验，建立了相应的演化模式。结果表明，不同沉积环境下，Ⅱ₂型煤系烃源岩在生油窗内具有一定的排油能力，也具备较强的烃气生成能力，既可以作为油源岩，也是高效气源岩；而Ⅲ型煤系烃源岩在生油窗内主要以滞留油为主，基本不具备排油能力，主要以排出烃气为主，仅能作为气源岩。生烃转化率主要受控于有机质类型，排烃能力还受控于岩性与丰度，按单位质量岩石而论，煤岩远高于其夹层中的碳质泥岩与泥岩。煤岩在全演化阶段，无论是低阶煤还是高阶煤均具有较强的生成烃气能力和较高的滞留油气能力，都具有煤层气开发潜力。
- 油气生成 /
- 油气排出 /
- 油气滞留 /
- 模拟实验 /
- 烃源岩 /
- 煤系地层
Abstract: To understand the effectiveness of hydrocarbon generation, expelling and retention capacities of coaly source rocks, carbonaceous mudstones and mudstones in coal layers and interlayers of different sedimentary environments and ages were selected to carry out the simulation experiments with a semi-open system operated at high tempera-ture and high pressure, and a corresponding model of evolution was established. With different depositional environments, the type Ⅱ₂ coaly source rocks expelled oil in the oil generation window with gas generated. Therefore, they worked as source rocks for both of oil and gas. However, for the coaly source rocks of type Ⅲ kerogen, the generated oil was mainly retained during the oil generation window and basically did not expel. As a result, this type of source rock was regarded as source rocks of gas only. The conversion rate of hydrocarbon generation was mainly controlled by the type of organic matter, while the ability to expel hydrocarbons was controlled by lithology and organic matter abundance. For each unit mass of rock, coal rocks has much higher conversion rates than the carbonaceous mudstones and mudstones in their interlayers. In the full evolution stage of coal rock, both low-rank and high-rank coals had strong ability for hydrocarbon gas generation and oil-and-gas retention, which showed a good potential for coal bearing methane development.
- hydrocarbon generation /
- hydrocarbon expelling /
- hydrocarbon retention /
- simulation experiment /
- source rock /
- coaly strata

HTML全文

图 1 煤系地层烃源岩总气体与二氧化碳产率演变特征

Figure 1. Evolution characteristics of total gas and carbon dioxide production rates of source rocks in coal measures

下载: 全尺寸图片幻灯片

图 2 煤系地层烃源岩烃气产率和产量曲线

Figure 2. Hydrocarbon gas yields and production curves of source rocks in coaly formations

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图 3 煤系地层烃源岩排出油产率与产量曲线

Figure 3. Oil production rates and curves of source rocks in coaly formation

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图 4 煤系地层烃源岩滞留油产率与产量曲线

Figure 4. Retained oil production rates and curves of source rocks in coaly formations

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图 5 煤系地层烃源岩总油气产率与产量曲线

Figure 5. Total oil and gas production rates and curves of source rocks in coaly formations

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图 6 煤岩生排滞留油气演化模式

Figure 6. Models showing hydrocarbon generation, expelling and retention in coaly source rocks

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图 7 煤系泥岩与碳质泥岩生排滞演化模式

Figure 7. Models showing hydrocarbon generation, expelling and retention in coaly mudstones and carbonaceous mudstones

下载: 全尺寸图片幻灯片

表 1 样品基本地球化学参数

Table 1. Basic geochemical parameters of samples

样品号	岩性	层位	剖面	ω(TOC)/%	沥青“A”/%	(S₁+S₂)/(mg·g^－1)	I_H/(mg·g^－1)	干酪根类型	R_o/%
H煤	煤	C－P	黑岱沟煤矿	59.77	0.86	78.79	114	Ⅲ	0.56
W煤	煤	E	五图煤矿	50.76	0.67	131.75	259	Ⅱ₂	0.47
Z碳泥	碳质泥岩	C－P	黑岱沟煤矿	23.29	0.12	18.39	79	Ⅲ	0.63
Z粉泥	黑色粉砂质泥岩	T	五图煤矿	2.22	0.17	6.89	254	Ⅱ₂	0.52

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表 2 煤系烃源岩生排烃模拟实验边界条件

Table 2. Boundary conditions of simulation experiment for hydrocarbon generation and expelling of coaly source rocks

模拟埋深/m	模拟温度/℃	上覆静岩压力/MPa				流体压力/MPa				排烃压差/MPa
模拟埋深/m	模拟温度/℃	H煤	W煤	Z碳泥	Z粉泥	H煤	W煤	Z碳泥	Z粉泥	H煤	W煤	Z碳泥	Z粉泥
1 100	200		26				13				2
1 350	225		32				16				3
1 650	250		40	40	40		20	20	20		3	3	3
1 800	265				43				22				4
1 900	275		46		46		23		23		4		4
2 150	300	52	52	52	52	26	26	26	26	4	4	4	4
2 350	315	56				28				5
2 400	320		58		58		29		29		5		5
2 500	330	60				30				5
2 600	340		62		62		31		31		5		5
2 700	350	65		65		32		32		5		5
2 850	360		68				34				6
2 950	370	71				35				6
3 000	375			72				36				6
3 050	380		73		73		37		37		6		6
3 150	390	76				38				6
3 250	400		78	78	78		39	39	39		7	7	7
3 400	415	82				41				7
3 450	420		83		83		41		41		7		7
3 600	430	86				43				7
3 800	450		91	91			46	46			8	8
3 900	460	94				47				8
4 350	500		104	104	104		52	52	52		9	9	9

下载: 导出CSV

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