四川盆地德阳—武胜拉张槽西段构造—沉积特征及勘探领域

罗开平; 曹清古; 彭金宁; 李龙龙; 曾华盛; 张宏

doi:10.11781/sysydz202002163

四川盆地德阳—武胜拉张槽西段构造—沉积特征及勘探领域

doi: 10.11781/sysydz202002163

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2.
中国石化石油勘探开发研究院, 北京 100083

基金项目:

中国石化科技部项目“川西二叠系成藏条件及勘探潜力分析” P18069-2

详细信息

作者简介:
罗开平(1964-), 男, 博士, 高级工程师, 从事石油地质综合研究。E-mail: luokp.syky@sinopec.com

中图分类号: TE121.1
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-10
- 修回日期: 2020-03-03
- 刊出日期: 2020-03-28

Tectonic-sedimentary characteristics and exploration plays in the western section of Deyang-Wusheng Intracratonic Sag, Sichuan Basin

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
SINOPEC Petroleum Exploration&Production Research Institute, Beijing 100083, China

摘要

摘要: 基于前人的认识和勘探成果，结合川西地区地球物理及地表地质资料，研究分析了四川盆地德阳—武胜拉张槽（西段）的结构及沉积充填特征，探讨了有利勘探领域及方向。德阳—武胜拉张槽是四川盆地晚二叠世长兴期在弱伸展背景下形成的北西向张性构造单元，具有两侧地层厚、中间地层薄的槽状结构特征。德阳—武胜拉张槽两侧边缘（台缘带）发育生物礁、生屑滩等高能相带沉积，有利于储层发育；槽中央发育较深水—深水环境下的微晶灰岩、硅质泥岩、碳质泥岩、页岩等岩性组合，是有利的烃源岩；其西段龙宝梁三维工区内沿着北西向台缘带发育带状生物礁，与下伏龙潭组等烃源岩及槽内长兴组泥页岩构成“下生上储”、“旁生侧储”源—储组合。该拉张槽边缘相带是油气的潜在勘探领域，龙宝梁地区是近期勘探的有利目标。
- 生物礁 /
- 沉积特征 /
- 源储组合 /
- 长兴组 /
- 上二叠统 /
- 德阳—武胜拉张槽 /
- 四川盆地
Abstract: The tectonic-sedimentary characteristics and exploration plays in the western section of the Deyang-Wusheng Intracratonic Sag in the Sichuan Basin were studied by combining geophysical and surface geological data and exploration results. The Deyang-Wusheng Intracratonic Sag is a northwest trending tectonic unit formed in the Changxing period of the Late Paleozoic under a weak extension stress background. It has a trough-like structure, and is thick on both sides and thin in the middle. High energy facies such as biological reefs and bioclastic beaches are developed at the edges (platform margins) on both sides, which is conducive to reservoir development. Lithological combinations of microcrystalline limestone, siliceous mudstone, carbonaceous mudstone and shale developed under deep water in the center of the trough are favorable source rocks. A strip-shaped biological reef developed along the northwest platform margin in the Longbaoliang 3D work zone in the western section of the Deyang-Wusheng Intracratonic Sag. Combined with underlying source rocks such as the Longtan Formation, it forms "lower source and upper reservoir" and "side by side" source-reservoir combinations. The marginal facies of the intracratonic sag is a potential exploration area, and the Longbaoliang area is a favorable target for exploration.
- biological reef /
- sedimentary characteristics /
- source-reservoir combination /
- Changxing period /
- Late Permian /
- Deyang-Wusheng Intracratonic Sag /
- Sichuan Basin

HTML全文

图 1 四川盆地及邻区晚二叠世长兴期构造—沉积格局^[7]

Figure 1. Structural-sedimentary pattern of Late Permian Changxing period in Sichuan Basin and adjacent area

下载: 全尺寸图片幻灯片

图 2 四川盆地磨溪1井—女基井—广3井长兴组连井对比剖面

剖面位置见图 3A-A′剖面。

Figure 2. Cross section of Changxing Formation through wells Moxi 1, Nüji and Guang 3, Sichuan Basin

下载: 全尺寸图片幻灯片

图 3 四川盆地上二叠统长兴组地层厚度示意

Figure 3. Strata thickness of Upper Permian Changxing Formation, Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 四川盆地德阳—武胜拉张槽和开江—梁平拉张槽结构对比剖面

剖面位置见图 3。

Figure 4. Structural profile of Deyang-Wusheng and Kaijiang-Liangping intracratonic sags, Sichuan Basin

下载: 全尺寸图片幻灯片

图 5 四川盆地及邻区晚二叠世长兴期岩相古地理及沉积相分布

Figure 5. Lithofacies paleogeography and sedimentary facies of Late Permian Changxing period in Sichuan Basin and adjacent area

下载: 全尺寸图片幻灯片

图 6 四川盆地及邻区典型钻井和野外剖面上二叠统长兴组岩性及沉积相剖面

Figure 6. Lithologic and sedimentary facies profile of Upper Permian Changxing Formation in Sichuan Basin and adjacent area

下载: 全尺寸图片幻灯片

图 7 四川盆地上二叠统长兴组野外岩石照片

Figure 7. Outcrop rock photos of Upper Permian Changxing Formation, Sichuan Basin

下载: 全尺寸图片幻灯片

图 8 四川盆地龙宝梁三维工区长兴组地层厚度展布及礁体地震相特征

工区位置见图 3。

Figure 8. Thickness distribution and seismic reef-face characteristics of Changxing Formation in Longbaoliang 3D work zone, Sichuan Basin

下载: 全尺寸图片幻灯片

图 9 四川盆地德阳—武胜拉张槽及邻区区带评价

图中Ⅰ~Ⅴ所代表的区带评价结果见表 1。

Figure 9. Zone evaluation of Deyang-Wusheng Intracratonic Sag in Sichuan Basin and adjacent area

下载: 全尺寸图片幻灯片

表 1 四川盆地德阳—武胜拉张槽及邻区区带评价

Table 1. Zone evaluation of Deyang-Wusheng Intracratonic Sag in Sichuan Basin and adjacent area

区带	构造位置	供烃强度/(10⁸m³·km^-2)	储层(相)	源储匹配	保存条件	圈闭落实	区带内钻井	目的层埋深/m	评价结果
Ⅰ	台地相，坳陷—斜坡	20	不确定	较差	较好	不落实	南充3井	5 000~6 500	一般
Ⅱ	台缘，坳陷—斜坡	15~20	台缘礁滩相	好	好	构造—地层、岩性圈闭	广探1、广3工业气流	5 500~8 000	较有利
Ⅲ	海槽(台洼)，坳陷—斜坡	15	不发育	较差	好	不落实	关基井、女基井、磨溪42	5 500~8 000	一般
Ⅳ	台缘，坳陷—斜坡	20~25	台缘礁滩相	好	好	构造—地层、岩性圈闭	磨溪1、磨溪32，安平1，王家1工业气流	5 500~8 000	有利
Ⅴ	台地，坳陷—斜坡	15~25	不确定	较差	较好	不落实	永胜1、永探1、高石1、资阳1	6 250	一般

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