陆相湖盆深水重力流沉积特征、砂体结构研究及油气勘探意义—以鄂尔多斯盆地上三叠统长7油层组为例

结合深水重力流沉积理论、野外剖面、岩心、测井等资料的分析，对鄂尔多斯盆地合水地区延长组长7油层组重力流沉积相和砂体结构的类型、特征进行了深入分析。研究表明长7沉积期发育大面积的深水砂岩，主要发育砂质碎屑流、浊流等重力流砂体，砂质碎屑流沉积以块状层理为主，单砂体厚度大，浊流沉积以粒序层理为主，砂泥互层频繁；结合重力流沉积背景下各成因砂体测井曲线形态、垂向发育厚度、垂向连续性及组合特征，将砂体垂向叠置结构划分为多期砂叠置厚层型、厚砂-薄泥互层型、厚砂-薄砂-泥互层型及薄砂-厚泥互层型四种类型，并对研究区单井砂体结构进行了聚类。实践表明，砂质碎屑流沉积区虽是油气藏有利聚集分布带，但分布面积较广，结合...

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Bibliographic Details
Published in地质与勘探 Vol. 54; no. 1; pp. 183 - 192
Main Author 时建超;屈雪峰;雷启鸿;祁越;李书恒;谢启超
Format Journal Article
LanguageChinese
Published 中国石油长庆油田分公司勘探开发研究院,低渗透油气田勘探开发国家工程实验室,陕西西安 710018 2018
Subjects
浊流
砂体结构
砂质碎屑流
鄂尔多斯盆地
重力流沉积
长7油层组
Ordos basin
砂质碎屑流
turbidity flow
鄂尔多斯盆地
重力流沉积
砂体结构
sand architecture
浊流
长7油层组
Chang 7 Formation
sediment of gravity flow
sandy debris flow
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ISSN0495-5331

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Summary:结合深水重力流沉积理论、野外剖面、岩心、测井等资料的分析，对鄂尔多斯盆地合水地区延长组长7油层组重力流沉积相和砂体结构的类型、特征进行了深入分析。研究表明长7沉积期发育大面积的深水砂岩，主要发育砂质碎屑流、浊流等重力流砂体，砂质碎屑流沉积以块状层理为主，单砂体厚度大，浊流沉积以粒序层理为主，砂泥互层频繁；结合重力流沉积背景下各成因砂体测井曲线形态、垂向发育厚度、垂向连续性及组合特征，将砂体垂向叠置结构划分为多期砂叠置厚层型、厚砂-薄泥互层型、厚砂-薄砂-泥互层型及薄砂-厚泥互层型四种类型，并对研究区单井砂体结构进行了聚类。实践表明，砂质碎屑流沉积区虽是油气藏有利聚集分布带，但分布面积较广，结合砂体结构特征，可进一步细化有利区划分，对致密油藏有利区的优选提供了新的研究思路。
Bibliography:Ordos basin, Chang 7 Formation, sediment of gravity flow, sandy debris flow, turbidity flow, sand architecture
11-2043/P
This paper presents an analysis of field profiles, cores and logging data based on the theory of deep-water gravity flow deposition. Our purpose is to describe the types and characteristics of gravity flow sedimentary facies and sand architecture of Chang 7 Formation in the Heshui area of Ordos Basin. Research shows that a large-extent deep-water sandstone formed during the sedimentary period of Chang 7 in this area, dominated by sandy debris flow, turbidity flow. The sandy debris flow created massive beddings with thick individual sand bodies. The turbidity flow mainly produced graded beddings with many sand-mud interbeds. In light of logging curves, vertical thickness and continuity, and combination, the structures of sand bodies are divided into four types, i.e. overlaps of multiphase sands, interbeds of thick sand and thin mud, interbeds of thick sand, thin sand and mud, and interbeds of
ISSN:0495-5331