天然气地球科学 ›› 2020, Vol. 31 ›› Issue (9): 12391249.doi: 10.11764/j.issn.1672-1926.2020.04.026
Zhao-feng ZHANG1(),Liang-jun WANG2(),Li-qiang ZHANG1(),Cheng-yin LI2
摘要:
川东南志留系小河坝组具有良好的生储盖组合,勘探前景较好,但小河坝组的沉积学和地球化学等基础研究薄弱,制约了目的层系的油气勘探。以川东南回龙场地区为例,系统采集了研究区小河坝组101个样品,利用常量及微量元素分析了小河坝组古沉积环境及其演化特征。结果表明,小河坝组主要形成于淡水—微咸水、温暖潮湿、弱氧化—弱还原的浅水三角洲沉积环境;纵向上,海平面变化表现为2个海侵—海退旋回,自下而上划分为X1、X2、X3和X4共4段。X1、X3段为海侵体系域(TST),气候温暖湿润,古盐度较低,水体还原性强,古水深较深;X2、X4段为高水位体系域(HST),气候干燥炎热,古盐度较高,水体还原性弱,古水深较浅。
中图分类号:
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