川东南地区中—下寒武统膏岩层系分布特征及其影响因素

朱彦先; 何生; 何治亮; 张殿伟; 张树林; 孙自明; 陶泽

doi:10.11781/sysydz202006910

川东南地区中—下寒武统膏岩层系分布特征及其影响因素

doi: 10.11781/sysydz202006910

1.
中国地质大学(武汉) 构造与油气资源教育部重点实验室, 武汉 430074
2.
中国石油化工股份有限公司, 北京 100728
3.
中国石化石油勘探开发研究院, 北京 100083

基金项目:

国家“十三五”科技重大专项子课题 2017ZX05005-001-008

中国石油化工股份有限公司科研项目 P19022-3

详细信息

作者简介:
朱彦先(1996—)，男，硕士研究生，从事油气成藏和构造解析研究。E-mail: 1201810213@cug.edu.cn

通讯作者:
何生(1956-), 男, 教授, 博士生导师, 从事油气地质及地球化学教学与研究。E-mail: shenghe@cug.edu.cn

中图分类号: TE121.3
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出版历程
- 收稿日期: 2020-05-29
- 修回日期: 2020-08-28
- 刊出日期: 2020-11-28

Distribution characteristics and influencing factors of Middle-Lower Cambrian gypsum in southeastern Sichuan Basin

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geoscience(Wuhan), Wuhan, Hubei 430074, China
2.
SINOPEC, Beijing 100728, China
3.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China

摘要

摘要: 川东南地区中—下寒武统龙王庙组和高台组为膏岩层系，石膏岩广泛发育，被认为是该区震旦系至中—下寒武统储层的盖层。通过统计钻井和二维地震资料，结合前人相关成果，研究膏岩层系的岩性、纵向发育和平面分布特征，分析构造挤压作用对石膏岩流动加厚和平面分布特征的影响。川东南地区中—下寒武统膏岩层系中与膏盐和含膏有关的岩性主要为石膏岩、白云质石膏岩、膏质白云岩与含膏白云岩，纵向上膏岩层系岩性组合和单层厚度变化较大，平面上石膏岩分布广，但累计厚度变化较大；在构造挤压作用下，川东南低陡构造带中—下寒武统石膏岩类常向背斜核部流动，造成石膏岩在背斜轴部明显加厚，揉皱和底辟等伴生构造发育；由于石膏岩的流动性，相应的膏岩层系厚度平面变化与低陡构造带的构造变形部位有相关性，沿低陡构造带的走向膏岩层系厚度在背斜部位一般加厚，在向斜部位减薄较明显。
- 石膏岩 /
- 膏岩层系 /
- 高台组 /
- 龙王庙组 /
- 中—下寒武统 /
- 川东南地区
Abstract: The Middle-Lower Cambrian Longwangmiao Formation and Gaotai Formation in southeastern Sichuan Basin are gypsum rock layer systems, where gypsum rocks are widely developed and considered to be the Sinian to Middle-Lower Cambrian reservoir seals. Based on the drilling data and 2D seismic profile data, and combined with previous research results, this paper studies the lithologic features, vertical development and plane distribution characteristics of the gypsum rock layer system and analyzes the influence of tectonic compression on the flow deformation and plane distribution characteristics of gypsum rock. The gypsum salt and gypsum bearing lithologies in the Middle-Lower Cambrian gypsum rock layer system in the study area mainly include gypsum rock and dolomitic gypsum rock, as well as gypsiferous dolomite and dolomite with gypsum. The lithologic association and single layer thickness of the gypsum rock layer system vary greatly vertically. The gypsum rocks are widely distributed in the plane, but the accumulated thickness changes greatly. Under tectonic compression, the Middle-Lower Cambrian gypsum rocks in the low-steep folds in the southeastern Sichuan Basin usually flowed into the core of the anticline and obviously thickened. Crumpled, diapir and other associated structures developed. Due to the fluidity of gypsum rock, the plane variation of gypsum rock thickness is related to the structural deformation position of the low-folds, which is generally thickened in the anticline along the strike of the low-steep folds and obviously thinned in the syncline.
- gypsum rock /
- gypsum rock layer system /
- Gaotai Formation /
- Longwangmiao Formation /
- Middle-Lower Cambrian /
- southeastern Sichuan Basin

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图 1 川东南地区构造纲要及井位、二维地震剖面位置

Figure 1. Structure outline map of southeastern Sichuan Basin and location of wells and seismic sections

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图 2 川东南地区下组合地层柱状图

Figure 2. Stratigraphic column of lower assemblage in southeastern Sichuan Basin

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图 3 川东南地区及邻区典型井位龙王庙组—高台组石膏岩类和膏质及含膏岩类累计厚度占地层厚度的百分比

Figure 3. Percentage histogram of accumulated thickness of gypsum rocks, gypsiferous and gypsum-bearing rocks in Longwangmiao-Gaotai formations in typical wells in southeastern Sichuan Basin and its periphery

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图 4 川东南地区典型钻井龙王庙组—高台组地层及膏岩层纵向分布特征

Figure 4. Vertical distribution of Longwangmiao-Gaotai formations and gypsum rock layers in typical wells in southeastern Sichuan Basin

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图 5 川东南地区阳1井中寒武统高台组膏岩层系中石膏岩层和膏质白云岩层测井响应特征

Figure 5. Logging response characteristics of gypsum rock layers and gypsiferous dolomite layers in Middle Cambrian Gaotai Formation in well Yang 1, southeastern Sichuan Basin

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图 6 川东南地区林1井中—下寒武统膏岩层系地震响应特征剖面位置见图 1A—A’。

Figure 6. Seismic response of Middle-Lower Cambrian gypsum rock layer system in well Lin 1, southeastern Sichuan Basin

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图 7 川东南地区中—下寒武统膏岩层系厚度分布

Figure 7. Thickness of Middle-Lower Cambrian gypsum rock layer system in southeastern Sichuan Basin

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图 8 川东南中—下寒武统膏岩层系厚度与低陡构造带分布关系

Figure 8. 3D configuration between thickness of Middle-Lower Cambrian gypsum rock layer system and low-steep folds the southeastern Sichuan Basin

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表 1 川东南及邻区中—下寒武统石膏岩类和膏质及含膏岩类岩性统计

Table 1. Lithologies of Middle-Lower Cambrian gypsum rocks, gypsiferous and gypsum-bearing rocks in southeastern Sichuan Basin and its periphery

井位	石膏岩类		膏质及含膏岩类
井位	石膏岩	白云质石膏岩	膏质白云岩	含膏白云岩	含膏石盐岩	膏质砂(泥)岩
阳深2井	0	0	129.5/26/1/32	2/2/1/1	0	2/2/1/1
阳1井	35/12/0.5/9	17/4/2/7	65.5/12/1/19	15/3/3.5/6	0	0
丁山1井	31.1/7/2/9.5	0	30.3/11/0.8/7	13.8/5/2/5.8	0	0
林1井	13/1/13/13	0	58/5/6/22	0	0	0
座3井	71/3/12/44	0	4/2/2/2	0	0	0
太和1井	97/10/2/28	8/2/4/4	113/12/3/32	5/1/5/5	0	1/1/1/1
合探1井	35/2/16/19	0	0	0	0	0
合12井	0	0	1/1/1/1	0	0	0
荷深1井	7/2/3/4	4/2/2/2	0	0	0	0
自深1井	0	0	17/2/？/？	0	0	0
塔探1井	20/7/1/8	4/2/2/2	28/8/2/7	0	11/1/11/11	0
注：表中数据含义为：累计厚度(m)/层数/单层最小厚度(m)/单层最大厚度(m)。

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