川北—川东地区中二叠世晚期地层划分新认识及地质意义

姚倩颖; 刘一锋; 江青春; 郝毅; 李景瑞; 吕学菊; 苏旺; 付小东

doi:10.11781/sysydz202102276

川北—川东地区中二叠世晚期地层划分新认识及地质意义

doi: 10.11781/sysydz202102276

1.
中国石油杭州地质研究院, 杭州 310023
2.
浙江大学, 杭州 310012
3.
中国石油勘探开发研究院, 北京 100083
4.
中国地质科学院岩溶地质研究所, 广西桂林 541004

基金项目:

“十三五”国家油气专项 2017ZX05008005

中国石油天然气股份有限公司重点科技项目 2018A-0105

中国石油天然气股份有限公司项目 KT2018-01-02

详细信息

作者简介:
姚倩颖(1988—)，女，硕士，工程师，从事碳酸盐岩沉积储层研究。E-mail：yaoqy_hz@petrochina.com.cn

通讯作者:
刘一锋(1987—)，男，博士，副教授，从事含油气盆地分析研究。E-mail：liuyf1103@zju.edu.cn

中图分类号: TE121.3
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- 文章访问数: 339
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-14
- 修回日期: 2020-12-17
- 刊出日期: 2021-03-28

Geological significance of late Mid-Permian stratigraphy in northern and eastern Sichuan Basin, SW China

1.
PetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, China
2.
Zhejiang University, Hangzhou, Zhejiang 310012, China
3.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
4.
Institute of Karst Geology, CAGS, Guilin, Guangxi 541004, China

摘要

摘要: 四川盆地中二叠统茅口组具有良好的勘探前景，但目前对川北—川东地区茅口晚期地层划分及相关地质认识存在不足。基于120口井的测井资料分析，并结合3条野外剖面的实测情况，重新识别了川北—川东地区茅口组与吴家坪组界面，进一步明确了茅口晚期沉积格局。取得以下3点认识：（1）自然伽马能谱测井可以有效识别茅口组上部硅质沉积物和吴家坪组底部泥页岩，依据新的地层划分方案，茅口组LHST2段（茅二a亚段—茅三段）尖灭线向东大幅推移至开县附近。（2）构造沉降控制了茅口晚期地层向东减薄和沉积演化。（3）茅口晚期沉积相由碳酸盐岩均斜缓坡相逐渐变为远端变陡缓坡相，最终演化为弱镶边台地相；远端变陡缓坡相控制了茅口组白云岩和硅质沉积物形成，弱镶边台地相控制了茅口组川北台缘带形成。
- 自然伽马能谱测井 /
- 硅质沉积物 /
- 构造沉降 /
- 沉积演化 /
- 吴家坪组 /
- 茅口组 /
- 川北—川东地区
Abstract: The Mid-Permian Maokou Formation in the Sichuan Basin shows good petroleum prospectivity. However, knowledge of the stratigraphy in the northern and eastern Sichuan Basin during the late Maokou period are still unclear. The interface between the Maokou and Wujiaping formations was re-identified, and the sedimentary pattern in the study area during the late Maokou period was clarified based on the logging data from 120 wells combined with the measured data of three field profiles. The results suggest the following. (1) Natural gamma-ray spectral logging can effectively identify the siliceous sediments at the top of Maokou Formation and the mud shale at the bottom of Wujiaping Formation. According to a new stratigraphic division, the erosional edge on LHST2 section of Maokou Formation moved eastward to the Kaixian area. (2) Tectonic subsidence controlled the eastward thinning and the sedimentary evolution in the late Maokou period. (3) The sedimentary evolution in the late Maokou period was from the homoclinal carbonate ramp facies to the distal steepening ramp facies, and then to the weak rimmed platform facies. Distal steepening ramp facies controlled the formation of dolomite and siliceous sediments, while the weak rimmed platform facies controlled the formation of the platform margin.
- natural gamma-ray spectral logging /
- siliceous sediment /
- tectonic subsidence /
- sedimentary evolution /
- Wujiaping Formation /
- Maokou Formation /
- northern and eastern Sichuan Basin

HTML全文

图 1 四川盆地中二叠统层序地层综合柱状图

据文献[14]修改。

Figure 1. Stratigraphic column of Middle Permian in Sichuan Basin

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图 2 川北—川东地区构造分区及资料点分布

据文献[18]修改。

Figure 2. Structural zoning and data point distribution in northern and eastern Sichuan Basin

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图 3 川北广元地区西北乡剖面茅口组地层柱状图

Figure 3. Stratigraphy of Maokou Formation in Xibeixiang section, Guangyuan area, northern Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 川北广元地区茅口组顶部与吴家坪组底部地层露头及镜下特征照片

a.西北乡剖面，茅口组—吴家坪组界面；b.XBX-P1样品点，单偏光，泥晶生屑灰岩；c.XBX-P3样品点，单偏光，硅质岩，可见放射虫形骸、海绵骨针和有孔虫；d.XBX-P5样品点，单偏光，硅质岩，可见放射虫和有孔虫；e.XBX-P7样品点，单偏光，泥页岩，纹层发育；f.XBX-P9样品点，单偏光，生屑灰岩，生物发育；g.XBX-P2样品点，黑色硅质岩；h.葛底坝剖面，茅口组—吴家坪组界面；i.屋基坪剖面，茅口组—吴家坪组界面

Figure 4. Outcrops and microscopic characteristics of strata at the top of Maokou Formation and the bottom of Wujiaping Formation, Guangyuan area, northern Sichuan Basin

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图 5 川北—川东地区茅口组LHST2段旧地层划分方案

Figure 5. Old stratigraphic division of Maokou Formation LHST2 in northern and eastern Sichuan Basin

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图 6 川北—川东地区吴家坪组底部地层测井响应特征

a.LT2井岩心照片，5 977.27 m，单偏光，沉凝灰岩；b.LT2井岩屑照片，6 018 m，正交光，凝灰质泥岩；c.LT2井岩屑照片，6 020 m，单偏光，碳质泥岩

Figure 6. Logging response characteristics of strata at the bottom of Wujiaping Formation in northern and eastern Sichuan Basin

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图 7 川北—川东地区茅口组LHST2段新地层划分方案

a.茅口组LHST2段灰岩低GR段；b.茅口组LHST2段硅质沉积物高GR段；c.吴家坪组泥页岩高GR段

Figure 7. New stratigraphic division of Maokou Formation LHST2 in northern and eastern Sichuan Basin

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图 8 川北—川东地区茅口组LHST2段3类测井相平面展布特征

Figure 8. Plane distribution of three logging facies of Maokou Formation LHST2 in northern and eastern Sichuan Basin

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图 9 四川盆地开江古隆起周缘茅口组—吴家坪组地层对比

剖面位置见图 8。

Figure 9. Stratigraphic correlation of Maokou-Wujiaping formations around Kaijiang Paleouplift, Sichuan Basin

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图 10 川北—川东地区茅口组LHST2段层序地层对比

剖面位置见图 8。

Figure 10. Sequence stratigraphic correlation of Maokou Formation LHST2 in northern and eastern Sichuan Basin

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图 11 川北—川东地区茅口组LHST2段单因素叠合图

Figure 11. Single factor overlap diagram of Maokou Formation LHST2 in northern and eastern Sichuan Basin

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表 1 川北—川东地区茅口组硅质岩与吴家坪组泥页岩自然伽马能谱测井数据

Table 1. Statistics of natural spectral gamma logging of Maokou Formation siliceous rocks and Wujiaping Formation mud shale in northern and eastern Sichuan Basin

井名	深度/m	地层	岩性	GR/API	U/10^-6	Th/10^-6	井名	深度/m	地层	岩性	GR/API	U/10^-6	Th/10^-6
NC1	4 978~5 006	吴家坪组	泥页岩	99.2	4.3	13.7			茅口组	硅质沉积物
YB3	7 128~7 142			123.0	4.7	19.9	YB3	7 178~7 211			117.1	13.4	1.8
TD23	4 733~4 740			114.7	3.7	13.1	TD23	4 740~4 748			192.0	15.5	1.7
TL2	5 500~5 516			108.1	4.9	11.8	TL2	5 579~5 585			102.9	10.0	2.2
JJ1	4 292~4 306			120.9	4.4	18.2	JJ1	4 369~4 372			118.0	13.9	3.1
L8	4 864~4 873			99.5	1.7	9.1	L8	4 957~4 963			84.3	10.6	1.9
PX1	3 756~3 769			92.2	2.9	13.7	PX1	3 769~3 791			157.0	14.5	5.7
HL5	4 878~4 891			104.5	2.8	9.8	HL5	4 891~4 899			129.1	14.1	3.1
MX3	4 779~4 785			100.2	3.2	14.2	MX3	4 785~4 788			115.1	9.6	0.9
TD26	4 314~4 332			120.5	2.6	12.4	TD26	4 385~4 399			96.8	10.4	3.0
CZ1	5 181~5 189			165.3	6.6	19.1	CZ1	5 189~5 192			198.7	20.1	4.9
LT2	6 016~6 021			164.0	7.2	13.7	LT2	6 021~6 037			142.9	13.6	4.8
平均值				117.7	4.1	14.1	平均值				132.2	13.2	3.0

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表 2 高GR段Th/U比值统计

Table 2. Th/U ratios of high GR section

井名	深度/m	地层	岩性	Th/U	沉积环境
NC1	4 978~5 006	吴家坪组	泥页岩	2.0~6.8/3.8	还原—氧化过渡环境
YB3	7 128~7 142	吴家坪组	泥页岩	3.1~19.5/5.5	还原—氧化过渡环境
PX1	3 756~3 769	吴家坪组	泥页岩	2.0~16.7/5.7	还原—氧化过渡环境
TD23	4 733~4 740	吴家坪组	泥页岩	2.1~10.4/4.7	还原—氧化过渡环境
YB3	7 178~7 211	茅口组	硅质沉积物	0.02~0.3/0.1	还原环境
PX1	3 769~3 791	茅口组	硅质沉积物	0.03~1.5/0.4	还原环境
TD23	4 740~4 748	茅口组	硅质沉积物	0.04~0.7/0.1	还原环境
注：表中算式含义为：最小值~最大值/平均值。

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