塔西南石炭系卡拉沙依组烃源岩评价与优选

doi:10.13809/j.cnki.cn32-1825/te.2024.04.015

摘要/Abstract

摘要：

塔西南地区石炭系油气显示丰富，为明确塔西南石炭系卡拉沙依组烃源岩生烃潜力，通过干酪根镜鉴、有机碳测试及盆地模拟等技术方法，对卡拉沙依组烃源岩进行研究评价，结果显示：卡拉沙依组烃源岩主要为Ⅲ型干酪根，TOC（总有机碳）含量介于0.2%~2.8%，平均值为1.0%，R_o（镜质体反射率）均超过0.7%。但烃源岩热演化过程存在差异，巴楚地区石炭系烃源岩仅在海西晚期一次生烃，麦盖提斜坡石炭系烃源岩存在海西晚期和喜山期两期生烃，结合烃源岩厚度、TOC、成熟度和生排烃史等多种因素，认为麦盖提斜坡区卡拉沙依组烃源岩均已成熟并持续生烃，西部山前带烃源岩品质及生烃强度最优。

关键词: 塔西南, 石炭系, 卡拉沙依组, 烃源岩评价, 热模拟

Abstract:

The study explores the abundant oil and gas reserves in the Carboniferous of the southwestern Tarim Basin, with a specific focus on the source rocks of the Carboniferous Kalashayi Formation. By conducting kerogen identification, total organic carbon（TOC） testing, and thermal simulation, the research revealed that these mudstone source rocks primarily consist of Type Ⅲ kerogen. Their TOC ranged from 0.2% to 2.8%, averaging 1.0%. The thermal maturity of the rocks, indicated by a vitrinite reflectance（R_o） greater than 0.7%, varied across different areas. The hydrocarbon generation history of these source rocks was also examined. In the Magaiti slope, the rocks underwent two phases of hydrocarbon generation: one during the Late Hercynian period and another during the Himeyama period. In contrast, in the Bachu bulge, there was only one hydrocarbon generation phase, occurring during the Late Hercynian period. The source rocks in the Magaiti slope are considered mature and are still generating hydrocarbons, influenced by factors such as source rock thickness, TOC, maturity, and the history of hydrocarbon generation and excretion. Furthermore, the source rocks in the western piedmont zone were identified as having the best quality and the highest hydrocarbon generation intensity.

Key words: southwestern Tarim Basin, Carboniferous, Kalashayi Formation, source-rock evaluation, thermal simulation

中图分类号:

TE122

张福顺,郑启明,胡瀚文等. 塔西南石炭系卡拉沙依组烃源岩评价与优选[J]. 油气藏评价与开发, 2024, 14(4): 647-656.

Fushun ZHANG,Qiming ZHENG,Hanwen HU, et al. Evaluation and optimal selection of Carboniferous Kalashayi Formation source rocks in southwestern Tarim Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(4): 647-656.

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	岩相	分布地区	干酪根类型	姥植比	C24/C26
潮坪—潟湖	煤、碳质泥岩暗色泥岩	巴麦地区	Ⅱ₂-Ⅲ型，偏Ⅲ型	一般小于1	一般大于0.6
陆棚	泥岩、灰质泥岩	塔西南坳陷及山前带	Ⅱ-Ⅲ型，偏Ⅱ型	一般大于1	一般小于0.6

井名	TOC含量/%			样品数量/个
井名	最大值	最小值	平均值	样品数量/个
巴探5	1.42	0.15	0.84	23
玛北1	1.43	0.93	1.08	4
皮山北2	1.83	0.95	1.34	5
玛4	2.06	0.38	1.10	18
山1	2.48	0.09	1.05	16
和1	1.35	0.29	0.97	18
玛参1	2.59	0.09	0.87	34
和田1	1.13	0.25	0.86	20

井号/剖面	岩性	井深/m	样品数量	（S₁+S₂）/（mg/g）		T_max/℃		I_H/（mg/g）		I_O/（mg/g）
井号/剖面	岩性	井深/m	样品数量	最大值~ 最小值	平均值	最大值~ 最小值	平均值	最大值~最小值	平均值	最大值~ 最小值	平均值
棋盘	灰黑色泥岩	露头	7	0.01~0.49	0.11	320~544	483	5~44	19	50~356	163
昔力必里	灰黑色灰质泥岩	露头	4	0~0.02	0.01	294~522	435	0~1	0	26~59	50
阿尔塔什	灰黑色含灰质泥岩	露头	6	0~0.15	0.03	445~509	481	0~20	6	45~380	239
巴探10	暗色泥岩	2 212~2 300	6	0.02~12.23	2.91	431~436	434	52~171	94	5~43	16
巴探11X	暗色泥岩	4 366~4 400	4	0.03~1.62	0.90	432~439	435	38~118	73	37~366	154
玛北1	暗色泥岩	2 860~3 113	11	0.01~1.86	0.68	429~434	432	30~163	64	11~127	33
皮山北2	暗色泥岩	5 923~6 100	6	0.03~1.61	0.79	441~460	453	34~66	49	2~82	29