天然气地球科学 ›› 2021, Vol. 32 ›› Issue (12): 1749–1761.doi: 10.11764/j.issn.1672-1926.2021.07.016

• 天然气地质学 •    下一篇

鄂尔多斯盆地长7段多类型页岩油特征及勘探潜力

付金华1,2(),郭雯1,3(),李士祥1,3,刘显阳1,3,程党性1,3,周新平1,3   

  1. 1.低渗透油气田勘探开发国家工程实验室,陕西 西安 710018
    2.中国石油长庆油田分公司,陕西 西安 710018
    3.中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018
  • 收稿日期:2021-06-03 修回日期:2021-07-18 出版日期:2021-12-10 发布日期:2021-12-27
  • 通讯作者: 郭雯 E-mail:fjh_cq@petrochina.com.cn;guowen_cq@petrochina.com.cn
  • 作者简介:付金华(1963-),男,湖北黄冈人,教授级高级工程师,博士,主要从事油气勘探开发研究和管理工作. E-mail:fjh_cq@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项(2017ZX05001002)

Characteristics and exploration potential of muti-type shale oil in the 7th Member of Yanchang Formation, Ordos Basin

Jinhua FU1,2(),Wen GUO1,3(),Shixiang LI1,3,Xianyang LIU1,3,Dangxing CHENG1,3,Xinping ZHOU1,3   

  1. 1.National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields,Xi’an 710018,China
    2.PetroChina Changqing Oilfield Company,Xi’an 710018,China
    3.Exploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi’an 710018,China
  • Received:2021-06-03 Revised:2021-07-18 Online:2021-12-10 Published:2021-12-27
  • Contact: Wen GUO E-mail:fjh_cq@petrochina.com.cn;guowen_cq@petrochina.com.cn
  • Supported by:
    The China National Science and Technology Major Project(2017ZX05001002)

摘要:

鄂尔多斯盆地三叠系延长组7段(长7段)沉积期为湖盆发育鼎盛阶段,发育一套以富有机质泥页岩为主夹砂质沉积的烃源岩层系。多年来,针对这套烃源岩层系的地质特征与勘探开发潜力,开展了一系列理论研究与技术攻关,结果表明:长7段主要发育夹层型和页岩型2类页岩油,其中夹层型页岩油可进一步细分为重力流夹层型和三角洲前缘夹层型,页岩型页岩油可进一步细分为纹层页岩型和页理页岩型。重力流夹层型页岩油受到湖盆中部优质烃源岩的高强度充注影响,砂质储层长英质含量高,可压裂性好,微米级孔隙众多,连通性好,目前在庆城油田已实现规模效益开发。三角洲前缘夹层型页岩油厚层砂岩储层横向连续性好,油气侧向运移成藏,砂质储层孔隙度较大,目前水平井试验攻关已获得突破,是现实的后备领域。纹层页岩型页岩油单砂体厚度薄、泥质含量高,致使优质储层钻遇率低,但油气充注程度高,“甜点”评价标准的确定与开发技术的突破是下一步的攻关方向,远景资源量巨大。页理页岩型页岩油储层长英质矿物含量高,纹层发育,孔隙度小于2%,储集空间小,结构复杂,烃类恢复预测资源量巨大,目前泥页岩储层的风险勘探与原位转化技术攻关都在稳步推进。

关键词: 页岩油, 类型, 地质特征, 勘探潜力, 延长组7段(长7段), 鄂尔多斯盆地

Abstract:

A set of organic-rich shale-dominated source rocks series with sandy deposits was developed during the heyday of lake basin development in the 7th Member of the Triassic Yanchang Formation (Chang 7 Member) in Ordos Basin. Over the years, aiming at the geological characteristics and exploration and development potential of this hydrocarbon source rock series, a number of theoretical studies and technical breakthroughs have been carried out. The research results show that: Shale oil in Chang 7 Member is mainly divided into two types: Interlayer and shale. The interlayer type can be further subdivided into gravity flow interlayer oil and delta front interlayer shale oil, and the shale type can be further subdivided into laminar shale oil and foliation shale oil. Gravity flow interlayer shale oil is highly charged by high quality source rocks in the middle of the lake basin. The sandy reservoir has high felsic content, good fracturing ability, numerous micron-size pores and good connectivity. Scale economy development has been realized in the Qingcheng Oilfield which was proved in the gravity flow interlayer shale oil. The thick sandstone reservoirs of delta front interlayer shale oil have good lateral continuity, lateral migration and accumulation of oil and gas, and large porosity of sandy reservoirs. Breakthroughs have been made in horizontal well tests, and it is a realistic backup field. The single sand body of laminar shale oil has thin thickness and high muddy content, which leads to low penetration rate of high-quality reservoirs, but high degree of oil and gas charging. The determination of “sweet spot” evaluation standard and the breakthrough of development technology are the next direction to be explored, and there is a huge amount of prospective resources. The foliation shale oil has high content of mud-scale felsic minerals, which is conducive to fracturing, reservoir space is small with porosity less than 2% and structure is complex, but hydrocarbon recovery and prediction resources are huge. At present, the risk exploration and in-situ conversion process of pure shale reservoirs are progressing steadily.

Key words: Shale oil, Type, Geological characteristics, Exploration potential, The 7th Member of Yanchang Formation, Ordos Basin

中图分类号: 

  • TE122.2+3

图1

鄂尔多斯盆地构造区划分及延长组地层柱状简图[22]"

表1

鄂尔多斯盆地长7段页岩油类型及特征对比"

“甜点”类型夹层型页岩型
重力流夹层型三角洲前缘夹层型纹层页岩型页理页岩型
岩性组合

半深湖—深湖相泥页岩

夹薄层砂岩

三角洲前缘泥岩夹厚层砂岩半深湖—深湖相厚层泥页岩夹薄层砂岩半深湖—深湖相黑色页岩、暗色泥岩为主
砂地比/%>20(一般<30)一般<305~20<5
单砂体 厚度/m<55~102~4<2
代表区块庆城油田

新安边油田

志靖—安塞地区

城页井组

正75井区

张22井区

主要发育 层位长71亚段、长72亚段长71亚段、长72亚段长73亚段长73亚段

图2

不同类型页岩油储层沉积岩石学与储集空间特征(a)阳检1井,2 025.92 m,长72亚段,重力流夹层型页岩油储层,块状细砂岩;(b)庄144井,1 809.4 m,长72亚段,重力流夹层型页岩油储层,块状细砂岩,石英含量高,石英长石等碎屑颗粒分选较好;(c)白284井,2 022.75 m,长71亚段,重力流夹层型页岩油储层,块状细砂岩,碎屑颗粒致密,孔隙较发育;(d)午231井,1 965.88 m,长71亚段,重力流夹层型页岩油储层,块状细砂岩,刚性石英颗粒之间粒间孔发育,丝缕状伊利石晶间孔发育;(e)耿347井,2 388 m,长72亚段,三角洲前缘夹层型页岩油储层,块状细砂岩;(f)冯118井,2 679 m,长71亚段,三角洲前缘夹层型页岩油储层,块状细砂岩,长石含量高,石英长石等碎屑颗粒分选较好;(g)耿347井,2 368.1 m,长71亚段,三角洲前缘夹层型页岩油储层,块状细砂岩,岩石致密,绿泥石较发育;(h)耿347井,2 364.69 m,长71亚段,三角洲前缘夹层型页岩油储层,块状细砂岩,石英颗粒粒间孔发育;(i)城96井,2 054.39 m,长73亚段,纹层页岩型页岩油储层,低密度浊流沉积正粒序层理粉砂岩;(j)城页1井,2 055.70 m,长73亚段,纹层页岩型页岩油储层,块状粉砂岩,泥级碎屑颗粒含量较高;(k)城页1井,2 052.85 m,长73亚段,纹层页岩型页岩油储层,块状粉砂岩,颗粒粒度极细;(l)城页1井,2 050.71 m,长73亚段,纹层页岩型页岩油储层,块状粉砂岩,长石溶孔十分发育,粒间孔发育;(m)城页1井,2 024 m,长73亚段,页理页岩型页岩油储层,黑色页岩,含油性好,纹层发育;(n)里57井,2 348.2 m,长73亚段,页理页岩型页岩油储层,黑色页岩,发育长石质纹层,有机质纹层;(o)城页1井,2 040 m,长73亚段,页理页岩型页岩油储层,黑色页岩,矿物沿页理方向排列发育,黄铁矿与有机质含量高;(p)城页1井,2 046.58 m,长73亚段,页理页岩型页岩油储层,黑色页岩,有机质含量高,石英、黄铁矿等刚性矿物周围发育粒间孔"

图3

不同类型页岩油储层孔隙度特征(a)重力流夹层型页岩油储层;(b)三角洲前缘夹层型页岩油储层;(c)纹层页岩型页岩油储层"

图4

不同类型页岩油储层渗透率特征(a)重力流夹层型页岩油储层;(b)三角洲前缘夹层型页岩油储层;(c)纹层页岩型页岩油储层"

图5

纹层页岩型页岩油储层三维孔喉网络特征(a)城页1井,长73亚段,2 051.31 m,粉砂岩,孔隙体积为947 280.252 μm 3;(b)城页1井,长73亚段,2 051.31 m,细砂岩,孔隙体积为6 526 570.518 μm3"

图6

不同类型页岩油成藏组合模式(a)重力流夹层型页岩油,主要分布于长71亚段和长72亚段,剖面位置见图7中AA’剖面;(b)三角洲前缘夹层型页岩油,主要分布于长71亚段和长72亚段,剖面位置见图7中BB’剖面;(c)纹层页岩型页岩油,主要分布于长73亚段,剖面位置见图7中CC’剖面;(d)页理页岩型页岩油,主要分布于长73亚段,剖面位置见图7中DD’剖面"

图7

鄂尔多斯盆地长7段多类型页岩油平面分布特征及有利区范围"

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