天然气地球科学 ›› 2022, Vol. 33 ›› Issue (4): 572–587.doi: 10.11764/j.issn.1672-1926.2021.11.001

• 天然气地质学 • 上一篇    下一篇

川西北地区中二叠统茅口组沉积演化及其对岩溶储层发育的控制

胡欣1(),王宇峰1,裴森奇1,曾琪1,李荣容1,龙虹宇1,李唐律1,周思宇2,孙海涛2()   

  1. 1.中国石油西南油气田分公司川西北气矿,四川 江油 621700
    2.中国石油大学(北京)地球科学学院,北京 102249
  • 收稿日期:2021-04-13 修回日期:2021-11-05 出版日期:2022-04-10 发布日期:2022-04-22
  • 通讯作者: 孙海涛 E-mail:hz0607@petrochina.com.cn;haitao.sun@cup.edu.cn
  • 作者简介:胡欣(1981-),男,云南罗平人,工程师,硕士, 主要从事石油地质综合研究. E-mail:hz0607@petrochina.com.cn .
  • 基金资助:
    国家自然科学基金项目“热水沉积过程中矿物沉淀的先后顺序及其控制因素——以白音查干凹陷下白垩统腾格尔组为例”(41972097);中国石油西南油气田公司科技项目“川西地区下二叠统气藏特征研究”(20220301-03-05)

Sedimentary evolution and its influence on karst reservoir development of the Middle Permian Maokou Formation in the northwestern Sichuan Basin, China

Xin HU1(),Yufeng WANG1,Senqi PEI1,Qi ZENG1,Rongrong LI1,Hongyu LONG1,Tanglü LI1,Siyu ZHOU2,Haitao SUN2()   

  1. 1.Northwest Sichuan Gas Field,Southwest Oil and Gasfield Company,PetroChina,Jiangyou 621700,China
    2.College of Geosciences,China University of Petroleum?Beijing,Beijing 102249,China
  • Received:2021-04-13 Revised:2021-11-05 Online:2022-04-10 Published:2022-04-22
  • Contact: Haitao SUN E-mail:hz0607@petrochina.com.cn;haitao.sun@cup.edu.cn
  • Supported by:
    The National Natural Science Foundation of China(41972097);the Science and Technology Project of PetroChina Southwest Oil and Gasfield Company(20220301-03-05)

摘要:

四川盆地西北部(川西北)地区中二叠统茅口组以灰岩储层为主,在局部地区取得了较好的天然气勘探效果。由于钻井资料的短缺,对川西北茅口组沉积相分布及演化缺乏明确认识,导致对储层发育控制因素认识不足,并影响了后续的油气勘探。为阐明茅口组储层的发育规律,利用钻测井及地震资料,通过将宏观与微观研究相结合,分析了茅口组沉积岩石的岩石类型及分布,探讨了有利沉积相分布及其对有利储层的控制。研究表明:川西北部地区茅一段—茅二段沉积时期,西部中坝—双鱼石地区发育台地边缘生屑滩沉积,其他地区以开阔台地灰质潟湖沉积为主,东侧九龙山地区发育台内生屑滩。茅三段沉积时期沉积格局发生较大变化,矿山梁—九龙山一带的相对海平面升高,发育盆地—斜坡相的硅质岩,并首次确定了该硅质岩为生物化学沉积。研究阐明了川西北地区中二叠统茅口组沉积格局的变化,提出双鱼石地区和九龙山地区茅口组沉积相分布及岩性的差异影响了二者的颗粒滩储层及岩溶储层的发育模式,为有利储层的勘探提供了地质依据。

关键词: 四川盆地, 茅口组, 碳酸盐台地, 岩溶储层, 硅质岩

Abstract:

The Middle Permian Maokou Formation in northwest Sichuan Basin is mainly composed of limestone, which is deeply buried and has poor physical properties. It is a kind of low porosity and low permeability reservoir, with some good area of natural gas exploration. In order to clarify the sedimentary characteristics of the ultra-deep reservoir of the Maokou Formation, this paper analyzes the reservoir rock lithology types and its distribution, sedimentary facies and its controlling to the favorable reservoir by using drilling, logging and seismic data, and further discusses the controlling factors on high-quality reservoir development. The results show that during the first and the second members of Maokou Formation in Northwest Sichuan, bioclastic beach of the platform margin was developed in the Zhongba-Shuangyushi areas, and open platform in the other areas. The bioclastic beach of open platform was developed in the Jiulongshan area. The sedimentary pattern changed greatly during the third member of Maokou Formation, the relative sea level raised in Kuangshanliang-Jiulongshan areas, and developed the basin-slope facies with silicalite of biochemical origin. So, there was a new platform margin which was formed in the area from Shuangyushi to Jiange. This study found the change of sedimentary pattern of the Middle Permian Maokou Formation in the northwestern Sichuan Basin, and it is found that the differences of sedimentary facies and lithology of the Maokou Formation in Shuangyushi area and Jiulongshan area affected the karstification mode of those two areas, which can guide the exploration of favorable reservoirs.

Key words: Sichuan Basin, Maokou Formation, Carbonate platform, Karst reservoir, Silicalite

中图分类号: 

  • TE121.3+1

图1

川西北地区主要钻井和断裂位置图(a)及中二叠统岩性柱状图(b)"

图2

川西北地区茅口组岩石类型及其微观特征(a) ST3井, 7 138 m,亮晶生屑灰岩;(b) ST1井,6 978 m,泥晶生屑灰岩,茜素红染色;(c) 屋基坪剖面,茅口组上部泥晶生屑灰岩,有孔虫保存完整,茜素红染色,单偏光;(d) L004-X1井 ,6 990 m,细晶白云岩,原岩结构消失 (e) K1井,4 218.64 m,中—粗晶白云岩,见鞍状白云石,单偏光;(f) K1井,4 218.64 m,中—粗晶白云岩,鞍状白云石可见波状消光,正交偏光;(g) L004-X1井, 6 166 m,云质灰岩,茜素红染色,单偏光;(h) S1井, 5 284.47 m,硅质岩,正交偏光; (i) 屋基坪剖面,茅口组顶部硅质岩,生物壳体内的放射状玉髓,正交偏光"

图3

川西北地区茅三段硅质岩成因判别(底图据 ADACHI等[19],KAWABE 等[20])"

图4

川西北地区茅口组各段露头岩性组合特征(a)长江沟剖面,茅口组和栖霞组分界面之上,茅一段底部中薄层泥晶灰岩夹薄层泥质灰岩(箭头处);(b)上寺剖面,栖霞组和茅口组分界面之上,茅一段浅灰色中薄层泥晶灰岩;(c)乌木沱剖面,茅二段灰白色中薄层泥晶灰岩和泥质灰岩,发育“似眼球状”构造;(d)乌基坪剖面,厚层生屑灰岩,可见珊瑚化石;(e)何家梁剖面,茅三段灰白色厚层生屑灰岩; (f)何家梁剖面,茅三段灰白色中厚层生屑灰岩;(g) 屋基坪剖面,茅三段灰黑色薄层硅质岩和浅灰色泥灰岩互层发育; (h)王家沟剖面,茅三段含灰黑色硅质条带的浅灰色泥晶灰岩;(i) 屋基坪剖面,茅三段顶部泥灰岩(脚下)以棕褐色王坡页岩(膝盖以上)为标志与吴家坪组分界"

图5

川西北地区茅口组连井沉积相对比剖面"

图6

川西北地区茅口组不同沉积相的岩石特征及储集空间特征(a) 金真村剖面,茅二段亮晶生屑灰岩,台缘生屑滩,单偏光;(b) 永庆剖面,茅三段生屑灰岩,颗粒大、含量高,台缘生屑滩,单偏光;(c)元坝7井,茅三段生屑灰岩,蜓类化石,台缘生屑滩,单偏光;(d)何家梁剖面,茅三段生屑灰岩,大型生物碎屑,台缘生屑滩,单偏光;(e)L004-X1井,6 202 m,茅二段砂屑灰岩,台内生屑滩,单偏光;(f) 何家梁剖面,茅二段泥晶颗粒灰岩,碎屑颗粒定向排列,滩间海沉积,单偏光;(g) 杨家岩剖面,茅二段含生屑泥粉晶灰岩,灰质潟湖沉积,正交偏光;(h) SY001-1井,7 040.66 m,茅二段暗色泥晶灰岩,滩间海沉积;(i) 屋基坪剖面,茅三段硅质岩,发育纹层及沿顺层分布的生物碎屑,盆地相,正交偏光;(j) ST3井,7 120.2 m 泥晶砂屑灰岩,可见未充填溶孔,砂屑滩沉积;(k)矿3井,4 216.73 m,白云岩中发育裂缝和溶蚀孔洞,原岩砂屑滩沉积;(l) L16井,5 660 m,泥晶生屑砂屑灰岩,可见为充填裂缝,砂屑滩沉积"

图7

川西北地区茅口组K2井单井沉积相"

图8

川西北地区茅口组各段主要岩石类型的单一因素含量等值线(a)茅一段生屑灰岩含量等值线图;(b)茅一段泥晶灰岩含量等值线图;(c)茅二段生屑灰岩含量等值线图;(d)茅二段泥晶灰岩含量等值线图;(e)茅三段生屑灰岩含量等值线图;(f)茅三段泥晶灰岩含量等值线图;(g)茅三段硅质岩含量等值线图"

图9

川西北地区茅口组各段的沉积演化展布图"

图10

过YB7井—LT1井—L17井时间偏移地震剖面"

图11

双鱼石地区不同钻井茅口组不同沉积亚相类型的孔隙度直方图"

图12

L16井茅口组灰岩储层测井响应特征"

图13

九龙山地区茅口组裂缝充填物包裹体均一温度直方图"

图14

川西北地区茅口组顶部王坡页岩的厚度等值线图"

图15

双鱼石地区茅口组地震属性切片(a)振幅;(b)相干性"

图16

九龙山地区茅口组地震属性切片(a)振幅;(b)相干性"

图17

川西北地区茅口组岩溶储层成因模式图"

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