天然气地球科学 ›› 2020, Vol. 31 ›› Issue (9): 1216–1224.doi: 10.11764/j.issn.1672-1926.2020.04.023

• 天然气地质学 • 上一篇    下一篇

四川盆地川中—川西地区沙溪庙组层序地层特征

肖富森(),韦腾强(),王小娟,关旭,吴长江,洪海涛   

  1. 中国石油西南油气田公司勘探开发研究院,四川 成都 610041
  • 收稿日期:2019-12-26 修回日期:2020-04-08 出版日期:2020-09-10 发布日期:2020-09-04
  • 通讯作者: 韦腾强 E-mail:xiaofs10@petrochina.com.cn;tqwei@petrochina.com.cn
  • 作者简介:肖富森(1963-),男,四川隆昌人,教授级高级工程师,主要从事地震勘探开发综合解释、应用及地震地质综合研究.E-mail: xiaofs10@petrochina.com.cn.
  • 基金资助:
    中国石油西南油气田公司科技项目“四川盆地沙溪庙组勘探潜力及成藏有利区评价研究”(20190301-17)

Research on the sequence stratigraphy of the Shaximiao Formation in Chuanzhong-Chuanxi area, Sichuan Basin

Fu-sen XIAO(),Teng-qiang WEI(),Xiao-juan WANG,Xu GUAN,Chang-jiang WU,Hai-tao HONG   

  1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China
  • Received:2019-12-26 Revised:2020-04-08 Online:2020-09-10 Published:2020-09-04
  • Contact: Teng-qiang WEI E-mail:xiaofs10@petrochina.com.cn;tqwei@petrochina.com.cn

摘要:

河流相是中国中、新生代陆相盆地重要的油气储层类型,而河流相地层划分一直以来也是一个难点。四川盆地川中—川西地区沙溪庙组发育河流相沉积,以陆相高分辨率层序地层理论为指导,通过“点—线—面”结合,对其开展层序地层研究。结果表明:①沙溪庙组可划分为3个三级与5个四级基准面旋回;5个四级旋回分别与沙一段,沙二1、沙二2、沙二3、沙二4亚段对应。②基准面旋回是控制沙溪庙组河道发育特征和叠加样式的主控因素;基准面较高时,可容纳空间大,地层沉积速度快,河道相对孤立,规模较小,地层泥岩含量较大;基准面较低时,地层沉积速率慢,河道原地摆动时间长,相互切割叠置,河道规模较大,地层泥岩含量相对少。沙溪庙组层序地层划分不仅提供了一个高精度的等时地层格架,同时也具有储层预测作用,对沙溪庙组天然气勘探具有重要意义。

关键词: 河流相, 层序地层, 基准面旋回, 沙溪庙组, 四川盆地

Abstract:

Fluvial facies is a significant type of hydrocarbon reservoirs in Mesozoic and Cenozoic continental basins in China, while the strata division of fluvial facies has always been a difficult theme. In Chuanzhong-Chuanxi area of Sichuan Basin, Shaximiao Formation developed fluvial facies. Based on the theory of continental high resolution sequence stratigraphy, combined with the principle of point-line-plane, this paper attempted to carry out sequence stratigraphy research on Shaximiao Formation. The results showed that: (1) Shaximiao Formation can be divided into three third-order base-level cycles and five fourth-order base-level cycles. The five fourth-order base-level cycles respectively corresponded to the first member, section 1 in second member, section 2 in second member, section 3 in second member, section 4 in second member of the Shaximiao Formation. (2)The base-level cycle affected the development and superimposed pattern of the source channel. When the base-level was high, the accommodation space was large, the strata got deposited quickly, and the channel was relatively spatial independent with small scale, the mudstone content was large. Differently, when the base-level was low, the strata got deposited slowly, the channel migrated frequently and incised each other, resulting in the formation of large scale channel, and the content of mudstone was relatively low. The sequence stratigraphic classification of Shaximiao Formation not only provided a high resolution isochronous stratigraphic framework, but also has a function of reservoir prediction, which is of great significance for gas exploration and development of the Shaximiao Formation.

Key words: Fluvial facies, Sequence stratigraphy, Base-level cycle, Shaximiao Formation, Sichuan BasinFoundation item:The Science and Technology Project of PetroChina Southwest Oil and Gasfield Company(Grant No. 20190301-17)

中图分类号: 

  • TE122.1

图1

侏罗系地层综合柱状图(a)与研究区位置(b)"

图2

河道型层序地层单元构成特点(据文献[26]修改)"

图3

沙溪庙组沙二段河道砂岩心综合柱状图"

图4

秋林地区沙溪庙组砂泥岩速度、GR交会图"

图5

沙二1亚段砂层组基准面变化控制的地层砂泥岩含量和速度变化特征(H井)"

图6

川中地区沙溪庙组单井层序地层划分"

图7

过井地震剖面沙溪庙组层序划分及河道砂纵向变化"

图8

秋林地区沙溪庙组层序地层划分及沿层地震均方根属性切片"

图9

川中—川西地区沙溪庙组层序演化模式及河道砂发育分布特征"

图10

基准面变化(A/S值)与河道宽度关系"

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[4] 付爽, 庞雷, 许学龙, 曹元婷, 刘振宇, 张顺存, . 准噶尔盆地玛湖凹陷下乌尔禾组储层特征及其控制因素[J]. 天然气地球科学, 2019, 30(4): 468 -477 .
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