川西新场地区中三叠统雷口坡组顶部风化壳裂缝分布特征及预测

朱兰; 李素华; 余洋; 李蓉; 石国山; 许国明

doi:10.11781/sysydz202203448

川西新场地区中三叠统雷口坡组顶部风化壳裂缝分布特征及预测

doi: 10.11781/sysydz202203448

中国石化西南油气分公司勘探开发研究院, 成都 610041

基金项目:

中国石化科技部项目"西南探区天然气富集规律与目标评价" P20059-3

详细信息

作者简介:
朱兰(1980-), 女, 工程师, 从事地震资料解释及储层预测研究。E-mail: 78019460@qq.com

通讯作者:
李素华(1980-), 女, 硕士, 副研究员, 从事储层预测及勘探目标评价等研究。E-mail: lish1121@163.com

中图分类号: TE122.2
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-19
- 修回日期: 2022-03-20
- 刊出日期: 2022-05-28

Fracture distribution and prediction of weathering crust reservoirs on the top of Leikoupo Formation, Xinchang area, western Sichuan Basin

Research Institute of Exploration and Development, Southwest Oil & Gas Branch, SINOPEC, Chengdu, Sichuan 610041, China

摘要

摘要: 川西中三叠统雷口坡组是四川盆地增储上产的重要阵地。近期，川西新场地区首次在雷口坡组顶部风化壳储层试气获工业气流，溶蚀孔洞和裂缝是主要的储集空间和渗流通道，如何准确预测雷口坡组顶部风化壳储层裂缝的分布特征，成为推动该地区勘探进程的关键。利用岩心观察和成像测井资料明确裂缝发育的地质特征，并采用相干、倾角、方位角和曲率属性等地震裂缝预测方法识别裂缝发育带的平面展布特征。雷口坡组顶部风化壳储层裂缝以中低角度为主，走向为北东—南西、北西—南东和近东西向；研究区中东部构造裂缝相对发育，主要发育在大断层附近；西南部发育北东—南西、北西—南东向“网状”层间裂缝，其中北东向裂缝规模较大。综合多种方法的分析结果，确定了雷口坡组顶部风化壳储层的裂缝发育特征及分布规律，预测结果与新钻井吻合较好，为下一步评价部署提供了可靠依据。
- 风化壳 /
- 裂缝 /
- 成像测井 /
- 曲率属性 /
- 雷口坡组 /
- 新场地区 /
- 川西
Abstract: The Leikoupo Formation in the western Sichuan Basin is an important potential stratum for the increasing of reserves and production. Recently, industrial grade gas flow has been discovered for the first time from weathering crust reservoirs on the top of Leikoupo Formation in the Xinchang area. Dissolution pores as well as fractures are the main storage spaces and seepage channels. Then, how to accurately predict the distribution characteristics of these cracks in weathered crust reservoirs has become a key factor of advance exploration process. Core observation and imaging logging data were applied to clarify the geological characteristics of fracture development. Some seismic prediction methods such as coherence, dip, azimuth and curvature attributes were used to identify the plane distribution characteristics of fracture development zones. Results show that the fractures in weathering crust reservoirs on the top of Leikoupo Formation are mainly in the middle and low angles, and the strikes are NE-SW, NW-SE and near EW. Structure fractures are mainly distributed in the central and eastern area and near the big fault. In the southwest of the study area, there are NE-SW and NW-SE "net-like" interlayer fractures, of which the scale of the NE fractures is larger. Based on the analysis results of multiple methods, the fracture characteristics and distribution rules of weathered crust reservoirs on the top of Leikoupo Formation were determined. The prediction results are consistent with newly drilled wells and provide a reliable basis for the evaluation in future.
- weathering crust /
- fracture /
- image logging /
- curvature attribute /
- Leikoupo Formation /
- Xinchang area /
- western Sichuan Basin

HTML全文

图 1 四川盆地新场地区构造位置(a)及其三叠系岩性剖面(b)

Figure 1. Tectonic location (a) and Triassic lithologic profile (b) of Xinchang area, Sichuan Basin

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图 2 四川盆地新场地区中三叠统雷口坡组顶部电成像图及岩心照片

Figure 2. Electrical imaging and core photos of the top of Middle Triassic Leikoupo Formation in Xinchang area, Sichuan Basin

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图 3 四川盆地新场地区中三叠统雷口坡组顶裂缝微观特征

a.X1井，5 544 m，发育多期裂缝，缝宽0.03 mm，40(+)；b.X1井，5 547 m，未充填缝，缝宽0.025 mm，100(-)；c.X1井，5 550.27 m，溶蚀扩大缝，缝宽0.025 mm，100(+)；d.X1井，5 531 m，溶蚀扩大缝，缝宽0.05 mm，100(+)；e.X1井，5 540 m，裂缝切割残余生屑，40(+)；f.X1井，5 543 m，裂缝切割砾屑，40(+)

Figure 3. Microscopic characteristics of top fractures of Middle Triassic Leikoupo Formation in Xinchang area, Sichuan Basin

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图 4 四川盆地新场地区中三叠统雷口坡组顶部裂缝产状

Figure 4. Fracture occurrence on the top of Middle Triassic Leikoupo Formation in Xinchang area, Sichuan Basin

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图 5 四川盆地新场地区中三叠统雷口坡组裂缝分布模式

Figure 5. Fracture distribution model of Middle Triassic Leikoupo Formation in Xinchang area, Sichuan Basin

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图 6 四川盆地新场地区中三叠统雷口坡组层间断层地震剖面

Figure 6. Seismic profile of interlayer faults in Middle Triassic Leikoupo Formation in Xinchang area, Sichuan Basin

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图 7 四川盆地新场地区中三叠统雷口坡组顶部相干、方位角、倾角属性三者叠合裂缝预测平面分布

注：椭圆形色标不同颜色代表不同方位角，同一种颜色的深浅程度代表倾角大小，颜色越深，倾角越大

Figure 7. Predicted plane distribution of superimposed fracture properties of coherent, azimuth and dip angle on the top of Middle Triassic Leikoupo Formation in Xinchang area, Sichuan Basin

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图 8 四川盆地新场地区中三叠统雷口坡组顶部最大正曲率属性裂缝预测平面分布

Figure 8. Predicted plane distribution of maximum positive curvature attribute fractures on the top of Middle Triassic Leikoupo Formation in Xinchang area, Sichuan Basin

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图 9 四川盆地新场地区中三叠统雷口坡组顶部裂缝预测有利区分布示意

Figure 9. Distribution area of fracture prediction at the top of Leikoupo Formation in Xinchang area, Sichuan Basin

下载: 全尺寸图片幻灯片

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