川中—川西地区茅口组顶部地震相特征与成因

发布时间：2018-02-01 10:34

本文关键词： 四川盆地茅口组地震相玄武岩　出处：《成都理工大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：为解决川中-川西地区钻井资料匮乏、受玄武岩喷发影响地层纵横向分布发生变化等问题,利用地震资料开展中二叠统茅口组及上覆地层地震相特征分析。通过地震识别,茅口组顶界在地震剖面上主要表现为强波峰地震反射,川中-川西地区茅口组顶界存在明显的弱振幅杂乱地震反射特征连片分布。根据沉积背景分析,认为川西南部地区、川西中部地区、川西北部地区、川中地区茅口组顶界弱振幅地震异常响应特征为火山喷发、火山沉积与碳酸盐岩喀斯特等不同地质作用所引起;结合茅口组上覆地层的差异,将川西-川中分为4个地震相区域。四川盆地上二叠统玄武岩在成都-简阳地区分布,早期可能为火山口爆发区,为油气勘探有利区带。
[Abstract]:In order to solve the problem of lack of drilling data in Chuanzhong-western Sichuan area and the change of vertical and horizontal distribution of strata affected by basalt eruption. The seismic facies characteristics of the middle Permian Maokou formation and the overlying strata are analyzed by seismic data. Through the seismic identification, the top boundary of the Maokou formation is mainly reflected by strong wave peak on the seismic profile. The top boundary of Maokou formation in central Sichuan and western Sichuan area has obvious weak amplitude random seismic reflection feature distribution. According to the analysis of sedimentary background, it is considered that southern Sichuan, central Sichuan and northern Sichuan. The characteristics of weak amplitude seismic anomalies at the top of Maokou formation in central Sichuan are volcanic eruption, volcanic deposition and carbonate karst. According to the difference of overlying strata in Maokou formation, the west Sichuan and central Sichuan are divided into 4 seismic facies regions. The upper Permian basalt in Sichuan basin is distributed in Chengdu-Jianyang area, and the early stage may be volcanic eruption area. A favorable zone for oil and gas exploration.
【作者单位】：中国石油西南油气田分公司勘探开发研究院;中国石化西南油气分公司勘探开发研究院;
【基金】：国家科技重大专项(2016ZX05007-004) 中国石油股份公司重大科技专项(2014E-3208GF,2016E-0604)
【分类号】：P618.13;P631.4
【正文快照】： 四川盆地二叠系上统包括长兴组/大隆组、龙潭组/吴家坪组,中统包括茅口组、栖霞组,下统包括梁山组。茅口组主要为碳酸盐岩台地相沉积,沉积泥晶灰岩、生物(屑)灰岩、残余生物灰岩和有机质泥质灰岩[1-2]。茅口组碳酸盐岩一直是四川盆地油气勘探重点层系。近年来,茅口组油气勘探

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