川东南地区中二叠统茅口组灰泥灰岩储层孔隙特征

韩月卿; 李双建; 韩文彪; 赵红琴; 刘光祥; 郝运轻

doi:10.11781/sysydz202204666

川东南地区中二叠统茅口组灰泥灰岩储层孔隙特征

doi: 10.11781/sysydz202204666

韩月卿^{1, 2,},
李双建^{1, 2, ,},
韩文彪³,
赵红琴⁴,
刘光祥^{1, 2},
郝运轻^{1, 2}

1.
中国石化深部地质与资源重点实验室, 北京 102206
2.
中国石化石油勘探开发研究院, 北京 102206
3.
中国石化油田部, 北京 100728
4.
中国石化中原油田分公司物探研究院, 河南濮阳 457000

基金项目:

国家自然科学基金企业创新发展联合基金项目 U19B6003

国家自然科学基金石化联合基金项目 U20B6001

详细信息

作者简介:
韩月卿(1992—), 女, 硕士, 助理研究员, 从事碳酸盐岩储层地质研究。E-mail: hanyq2018.syky@sinopec.com

通讯作者:
李双建(1978—), 男, 博士, 研究员, 从事石油地质研究。E-mail: lishuangjian.syky@sinopec.com

中图分类号: TE122.23
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- 被引次数: 0
出版历程
- 收稿日期: 2022-03-09
- 修回日期: 2022-06-15
- 刊出日期: 2022-07-28

Pore characteristics of marl reservoir in Maokou Formation of Middle Permian, southeastern Sichuan Basin

HAN Yueqing^{1, 2
,},
LI Shuangjian^{1, 2
, ,},
HAN Wenbiao³,
ZHAO Hongqin⁴,
LIU Guangxiang^{1, 2},
HAO Yunqing^{1, 2}

1.
Key Laboratory of Deep Geology and Resources, SINOPEC, Beijing 102206, China
2.
Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 102206, China
3.
Oil-field Department, SINOPEC, Beijing 100728, China
4.
Institute of Geophysical Exploration, SINOPEC Zhongyuan Oilfield Branch Company, Puyang, Henan 457000, China

摘要

摘要: 近期川东南多口钻井在茅口组一段灰泥灰岩储层实现了油气勘探突破，其作为一种新类型非常规气藏得到了大量关注。为了进一步弄清该区茅一段灰泥灰岩储层的岩石学特征和储层孔隙特征，基于野外和岩心样品，开展了岩石学和储层孔隙表征工作。研究表明：①茅一段主要发育于外缓坡相，灰泥灰岩的总有机碳含量平均值为0.76%~1.1%，平面上自北西向南东呈增大的趋势，与孔隙度变化趋势相似。②茅一段灰泥灰岩储集空间主要包含有机质孔、无机孔和微裂缝三大类，其中有机质孔可分为独立的有机质孔隙、包裹滑石的有机质孔隙和黄铁矿晶间有机质孔隙，无机孔可分为粒间孔、晶间孔、晶体内部溶孔，微裂缝可分为滑石缝、粒缘缝、应力缝；有机质孔在川东南地区茅一段灰泥灰岩储层中并不占主导地位，微裂缝是灰泥灰岩最重要的储集空间。③通过低温氮气吸附、低温CO₂吸附、高压压汞实验以及纳米CT扫描联合表征，灰泥灰岩储层孔隙以细颈广体的墨水瓶形孔为主，微孔、中孔、宏孔均有发育，孔径主要分布在0.4~100 nm，跨度范围较大；灰泥灰岩非均质性明显，连通性较差，裂缝对于连通孔隙有重要影响。茅一段灰泥灰岩为一套新类型非常规储层，鉴于其复杂的矿物组成和特殊的孔隙特征，需加强有针对性的酸化压裂技术攻关，从而促进灰泥灰岩储层的油气勘探开发。
- 灰泥灰岩 /
- 孔隙特征 /
- 储层 /
- 茅口组 /
- 中二叠统 /
- 川东南地区 /
- 四川盆地
Abstract: Breakthroughs of oil and gas exploration have recently been achieved via several wells in marl reservoirs of the first member of the middle Permian Maokou Formation in the southeastern Sichuan Basin. As a new type of unconventional gas reservoir, a lot of attention was attracted. In order to understand lithological characte-ristics and pore characteristics of marl reservoirs, lithological, pore types and pore structure characterization, works were carried out based on field and core samples. Results show that: (1) The TOC content of the marl reservoirs, which is mainly in outer gently sloping facies, is 0.76%-1.1%, with an increasing trend from northwest to southeast, similar to porosity changes. (2) Reservoir spaces of the marls mainly include organic pores, inorganic pores and microfractures. The organic pores can be classified into independent organic pores, organic pores with talc and intergranular organic pores of pyrite. The inorganic pores can be classified into intergranular pores, intercrystalline pores, and crystal dissolved pores. The microfractures can be classified into talc fractures, grain boundary fractures, and stress fractures. Organic pores are not dominant in the marl reservoirs, while microfractures are the most important reservoir space. (3) Combined characterization of cryogenic nitrogen adsorption, cryogenic CO₂ adsorption, high-pressure Hg injection experiments and CT scan show that pores of the marls are mainly ink-bottle shaped with narrow neck and wide body. Micropores, mesopores and macropores are developed, with pore diameters of about 0.4-100 nm. The marls have obvious lithologic heterogeneity and poor connectivity. Fractures have an important influence on the connected pores. The marl in the first member of the Maokou Formation is a new type of unconventional reservoir, which has complex mineral composition and special pore characteristics. Targeted acid fracturing technology should be strengthen to promote the exploration and production of the marl reservoir.
- marl /
- pore characteristics /
- reservoir /
- Maokou Formation /
- Middle Permian /
- southeastern Sichuan Basin /
- Sichuan Basin

HTML全文

图 1 川东南地区中二叠统茅口组一段TOC等值线图与MY1井综合柱状图

Figure 1. TOC contour map of first member of Middle Permian Maokou Formation and lithologic histogram of well MY 1, southeastern Sichuan Basin

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图 2 川东南地区中二叠统茅口组一段连井对比剖面

Figure 2. Stratigraphic correlation of wells, first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 3 川东南地区中二叠统茅口组一段灰泥灰岩野外露头及岩心特征

a-b.灰黑色灰泥灰岩与灰色颗粒灰岩互层发育，茅一段，冷水溪剖面；c.眼球状灰岩，茅一段，MY1井；d.黑色块状灰泥灰岩，茅一段，YH1井；e.深灰色灰泥灰岩，生物碎屑顺层发育，茅一段，DX1井；f.灰黑色灰泥灰岩具页理状特征，裂缝内见大量沥青、方解石及石英充填，茅一段，PQ1井

Figure 3. Characteristics of field and core samples of marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 4 川东南地区中二叠统茅口组一段灰泥灰岩岩石学特征

a.灰泥灰岩，见大量生屑堆积，有机质和自生石英发育，正交光，MY1井；b.灰泥灰岩，有机质非常发育，石英充填其中，正交光，MY1井；c.灰泥灰岩，发育石英脉，被裂缝断穿，正交光，MY1井

Figure 4. Petrologic characteristics of marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 5 川东南地区中二叠统茅口组一段灰泥灰岩样品矿物成分组成

Figure 5. Mineral composition of marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 6 川东南地区中二叠统茅口组一段灰泥灰岩有机质孔微观特征

a.有机质赋存在方解石粒间缝内，茅一段，MY1井；b.有机质与滑石伴生发育，茅一段，MY1井；c.滑石包卷赋存于有机质中，呈丝缕状，茅一段，MY1井；d.滑石包卷于有机质孔隙内，呈丝带状，茅一段，MY1井；e.草莓状黄铁矿集合体，茅一段，YH1井；f.黄铁矿晶体间发育有机质，有机质孔较为发育，茅一段，MY1井

Figure 6. Microscopic characteristics of organic pores in marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 7 川东南地区中二叠统茅口组一段灰泥灰岩微裂缝微观特征

a.有机质与滑石伴生，茅一段，MY1井；b.硅球、方解石与滑石成基底式胶结，茅一段，MY1井；c.白云石与滑石接触面发育粒缘缝，茅一段，MY1井；d.白云石周缘发育粒缘缝，茅一段，MY1井；e.应力缝沿粒缘缝和滑石缝发育，茅一段，MY1井；f.黄铁矿集合体附近发育应力缝，茅一段，MY1井

Figure 7. Microscopic characteristics of microfractures in marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 8 川东南地区中二叠统茅口组一段灰泥灰岩无机孔微观特征

a.灰泥灰岩，见介壳类和棘皮类生屑，介壳类生屑被部分硅化，发育粒间孔，正交光，茅一段，MY1井；b.灰泥灰岩，大量生物碎屑堆积，生屑间发育粒间孔，正交光，茅一段，MY1井；c-d.白云石晶间孔，呈不规则状，茅一段，MY1井；e.白云石表面见溶孔，茅一段，MY1井；f.白云石表面溶孔内见自生石英，茅一段，MY1井

Figure 8. Microscopic characteristics of inorganic pores in marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 9 川东南地区中二叠统茅口组一段灰泥灰岩孔隙度等值线及与TOC交汇图

Figure 9. Porosity contour map and cross plots of TOC of marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 10 川东南地区中二叠统茅口组一段灰泥灰岩低温氮气吸附—脱附曲线

Figure 10. Low-temperature liquid nitrogen absorption and desorption curves of marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 11 川东南地区中二叠统茅口组一段灰泥灰岩孔径分布

Figure 11. Pore size distribution of marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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图 12 川东南地区中二叠统茅口组一段灰泥灰岩样品CT扫描图像

Figure 12. CT scanning images of marls in first member of Middle Permian Maokou Formation, southeastern Sichuan Basin

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