利用滩地比技术描述碳酸盐岩沉积相

肖陈静; 胡修权; 施泽进; 谭谦; 李江寒; 易驰; 李世临; 徐发波

doi:10.11932/karst2022y03

利用滩地比技术描述碳酸盐岩沉积相——以川东地区茅二^a亚段为例

doi: 10.11932/karst2022y03

肖陈静^{1, 2,},
胡修权^{1, 2, ,},
施泽进^{1, 2},
谭谦^{1, 2},
李江寒^{1, 2},
易驰^{1, 2},
李世临³,
徐发波³

1.
成都理工大学能源学院, 四川成都 610059
2.
成都理工大学“油气藏地质及开发工程”国家重点实验室,四川成都 610059
3.
中国石油西南油气田分公司重庆气矿, 重庆 400707

基金项目: 国家自然科学基金“基于深度学习地震多属性预测碳酸盐岩沉积相展布（42172175）”；“四川盆地东南部及周缘震旦系—寒武系微生物成岩作用与孔隙演化（41872137）”；广西自然基金项目（2018JJB150094）；广西科技研发项目（2018AD19040）

详细信息

作者简介:
肖陈静（1996－），女，硕士研究生，研究方向：油气藏地质学与成藏动力学。E-mail：xiao.chen.2015＠qq.com

通讯作者:
胡修权（1985－），男，讲师，博士，从事地震地层及储层预测的教学与科研工作。E-mail： huxiuquan15@cdut.edu.cn

中图分类号: P618.13
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出版历程
- 收稿日期: 2021-10-20
- 网络出版日期: 2023-01-06
- 刊出日期: 2022-12-25

Describing carbonate sedimentary facies by use of the radio of shoals to the whole strata :Taking the layer a of Mao2 submember in eastern Sichuan for example

XIAO Chenjing^{1, 2
,},
HU Xiuquan^{1, 2
, ,},
SHI Zejin^{1, 2},
TAN Qian^{1, 2},
LI Jianghan^{1, 2},
YI Chi^{1, 2},
LI Shilin³,
XU Fabo³

1.
College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, China
2.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
3.
Chongqing Gas District, PetroChina Southwest Oil & Gasfield Company, Chongqing 400021, China

摘要

摘要: 为了精细描述碳酸盐岩储层展布，对滩相沉积刻画的精度要求日益增高。针对川东地区茅口组地层因抬升遭受剥蚀，难以统计颗粒滩真实厚度的问题，提出结合滩地比技术刻画碳酸盐岩滩相类型及分布范围，进而开展碳酸盐岩沉积相描述。利用丰富的钻井资料，通过滩相识别标志建立、连井沉积对比、滩地比统计以及沉积相平面展布等一系列研究，揭示川东地区茅二^a亚段从南西到北东沉积相带展布依次为开阔台地－台地边缘－斜坡－盆地，其中台地边缘在邻水县－丰都县－忠县一带近似呈东西条带状展布；台内低能滩和斜坡低能滩主要分布在滩地比0.3~0.5的区域，台内高能滩在滩地比0.5~0.6的区域发育，台缘滩主要分布在滩地比0.6~0.8的区域，钻井试气结果表明滩相沉积对油气产能具有一定的控制作用，且台缘滩比台内高能滩更具有勘探潜力。本次研究表明在碳酸盐岩地层被剥蚀地区，相比滩体厚度，利用滩地比能够更准确的分析颗粒滩的类型及展布范围，从而判断研究层段颗粒滩发育情况。
- 川东地区 /
- 碳酸盐岩滩相 /
- 茅二^a亚段 /
- 沉积相展布 /
- 台地边缘
Abstract: The accurate description of the distribution of carbonate reservoirs requires increasing precision for the characterization of beach facies sedimentation. In view of the difficulty in calculating the real thicknesses of granular beaches on Maokou formation in eastern Sichuan due to uplift and erosion of strata, we characterized the types and distribution range of carbonate beaches based on the ratios of shoal thicknesses to the whole stratum thickness, and then described the carbonate sedimentary facies. Based on abundant drilling data, we conducted a case study by the establishment of identification marks of beach facies, the correlation of inter-well sedimentation, ratios of shoal thickness to stratum thickness and the planar distribution of sedimentary facies. This study indicates that the distribution of sedimentary facies in layer a of Mao2 submember from southwest to northeast in eastern Sichuan is respectively open platform, platform margin, slope and basin, among which the platform margin is approximately east-west banded in the area of Linshui-Fengdu-Zhongxian. The low-energy beaches both in the platform and in the slope are mainly distributed in the area with ratios of shoal thickness to stratum thickness of 0.3-0.5; the high-energy beach in the platform is developed in the area with ratios of 0.5-0.6; and the marginal platform beach is mainly distributed in the area with ratios of 0.6-0.8. The results of well gas test show that beach facies have a certain controlling effect on oil-gas productivity, and the marginal platform beach has more exploration potential than the high-energy beach in the platform. The study shows that in the area where carbonate strata are eroded, compared with the thickness of beach, the use of the ratios of shoal thickness to the whole stratum to accurately analyze the type and distribution range of granular beach so as to judge the development of granular beaches in the layer section.
- eastern Sichuan /
- carbonate beach facies /
- layer a of Mao2 submember /
- distribution of sedimentary facies /
- platform margin

HTML

图 1 川东茅二a 亚段颗粒岩厚度等值线图

Figure 1. Thickness contour map of granulite in Layer a of Mao 2 submember in eastern Sichuan

下载: 全尺寸图片幻灯片

图 2 Xiang14 井综合柱状图

Figure 2. Comprehensive columnar map of Well Xiang14

下载: 全尺寸图片幻灯片

图 3 研究思路及流程图

Figure 3. Research ideas and flow chart

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图 4 川东茅二^a亚段（P₁ m ^2a）颗粒灰岩岩石学特征

A-生屑泥晶灰岩，Chi10井 B-亮晶生屑灰岩，Wo56井 C-泥晶生屑灰岩，Chi6井 D-泥晶藻屑灰岩，涪陵老黄轩剖面

Figure 4. Petrological characteristics of Layer a of Mao2 submember grain limestone in eastern Sichuan

A-Bioclastic limestone with coral in Well Guan2 B-Sparry bioclastic limestone in Well Wo56 C-Micrite biodetritus limestone in Well Chi6 D-Micritic algal clast limestone in the section plane of Laohuangxuan

下载: 全尺寸图片幻灯片

图 5 川东Chi12井台地边缘亚相柱状图

Figure 5. Histogram of platform margin subfacies of Well Chil2 in eastern Sichuan

下载: 全尺寸图片幻灯片

图 6 川东Sha5-Xiang14-Ban3-Cheng20-QL12井茅口组连井沉积相对比图

Figure 6. Maokou formation sedimentary comparison diagram of Well Sha5-Xiang14-Ban3-Cheng20-QL12 in eastern Sichuan

下载: 全尺寸图片幻灯片

图 7 川东Ban3-Zhang18-Wo79-Chi10-Chi6-Feng11井茅口组连井沉积相对比图

Figure 7. Maokou formation sedimentary comparison diagram of Well Ban3-Zhang18-Wo79-Chi10-Chi6-Feng11 in eastern Sichuan

下载: 全尺寸图片幻灯片

图 8 茅二^a亚段沉积相平面展布图

Figure 8. Planar distribution diagram of sedimentary facies in layer a of Mao2 submember

下载: 全尺寸图片幻灯片

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