吉木萨尔凹陷芦草沟组页岩油接替区开发潜力

doi:10.7657/XJPG20250607

摘要/Abstract

摘要： 吉木萨尔凹陷芦草沟组页岩油接替区页岩油资源量大，但该区储集层厚度较小，甜点分布非均质性强。通过有机地球化学、岩石学、微观孔隙结构、油气赋存与可动性等实验测试，对接替区烃源岩、原油性质、储集层岩性、孔隙类型、页岩油赋存特征及可动性开展系统评价。结果表明：接替区烃源岩条件优良，相较于主力区普遍经历2期生烃高峰，原油密度与黏度显著降低，轻质组分占比提高；接替区储集层厚度小、粒度细，粒间孔不发育，溶蚀孔与晶间孔更发育，孔隙直径分布范围与主力区相近，但孔喉半径较主力区小；接替区与主力区均表现为多类型孔隙含油特征，页岩油赋存方式相似，接替区游离烃赋存的孔隙直径下限为40~60 nm，小于主力区；原油黏度对页岩油可动性具有显著控制作用，低黏度条件下接替区可动性较强，核磁共振可动性解释截止值较主力区小；可动油量、含油饱和度、孔隙压力及脆性是影响接替区产能的关键因素。在此基础上，提出了四因素权重组合的甜点评价技术，接替区甜点识别精度大于80%，研究成果为芦草沟组页岩油的稳产提供了理论支撑。

关键词: 吉木萨尔凹陷, 芦草沟组, 页岩油, 未动用储量, 开发潜力, 甜点评价

Abstract:

In the Jimsar sag, the replacement areas for shale oil development in the Lucaogou formation contain abundant resources, but exhibit small reservoir thickness and heterogeneous sweet spot distribution. Through experimental tests involving organic geochemistry, petrology, pore structure, and hydrocarbon occurrence/mobility, a comprehensive evaluation was conducted on the source rock, crude oil property, reservoir lithology, pore type, and shale oil occurrence/mobility in the replacement areas. The results show that the replacement areas have favorable source rock conditions, and have generally experienced two oil-generating peaks, with significantly lower crude oil density and viscosity and a higher proportion of light components, as compared with the primary zones. The reservoirs in the replacement areas are characterized by small thickness and fine grain size, with underdeveloped intergranular pores but relatively developed dissolution pores and intercrystalline pores, demonstrating a similar pore size range to the primary zones but smaller pore-throat radii than the latter. Both the replacement areas and primary zones hold oil in multiple types of pores, with similar shale oil occurrence patterns. The lower limit of pore size for free hydrocarbon occurrence in the replacement areas is 40-60 nm, which is smaller than that in the primary zones. Crude oil viscosity has a significant control effect on shale oil mobility. Under low viscosity conditions, the crude oil in the replacement areas is highly mobile, with a smaller cutoff than the primary zones according to the nuclear magnetic resonance (NMR) mobility interpretation. The movable oil quantity, oil saturation, pore pressure, and brittleness are the key factors affecting the productivity of the replacement areas. Based on these research insights, a sweet spot evaluation technique combining the weights of these four factors was reconstructed, revealing an accuracy of sweet spot identification in the replacement areas exceeding 80%. The research results provide theoretical support for the stable production of shale oil in the Lucaogou formation.

Key words: Jimsar sag, Lucaogou formation, shale oil, non-producing reserves, development potential, sweet spot evaluation

中图分类号:

TE122.1

李庆, 罗刚, 李映艳, 邓远, 肖佃师, 谢潇权. 吉木萨尔凹陷芦草沟组页岩油接替区开发潜力[J]. 新疆石油地质, 2025, 46(6): 712-722.

LI Qing, LUO Gang, LI Yingyan, DENG Yuan, XIAO Dianshi, XIE Xiaoquan. Potential of Replacement Areas for Shale Oil Development in the Lucaogou Formation, Jimsar Sag[J]. Xinjiang Petroleum Geology, 2025, 46(6): 712-722.

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岩性	轻质游离烃	中质游离烃	吸附烃	束缚烃
粉砂质页岩	48.27	22.19	5.78	23.76
含白云屑粉砂质页岩	52.56	15.16	6.32	25.96
含白云粉砂质页岩	23.70	28.61	17.42	30.27
含粉砂白云质页岩	9.60	37.76	24.64	28.00
泥晶白云质页岩	2.13	15.10	41.91	40.86

甜点类型	综合评价因子	可动油孔隙度/%	含油饱和度/%	孔隙压力/MPa	脆性指数	归一化产能强度	油层类型
Ⅰ类	>0.350	>1.85	>72.2	>60.0	>0.38	>0.58	Ⅰ
Ⅱ类	0.295~0.350	1.45~1.85	71.5~72.2	49.9~60.0	0.33~0.38	0.30~0.58	Ⅱ
Ⅲ类	0.180~0.295	0.55~1.45	62.2~71.5	47.3~49.9	0.30~0.33	0.10~0.30	Ⅲ
无效	<0.180	<0.55	<62.2	<47.3	<0.30	<0.10	无效