摘要
为剖析陕北地区长9深部油气成藏特征,总结其成藏模式,针对其成藏要素及油藏类型有待明确等问题,运用岩心观察、铸体薄片、扫描电镜、生物标志化合物对比等方法进行研究,得出以下结论:陕北地区延长组长9段主要发育三角洲前缘和浅湖沉积亚相;长9顶部所发育的浅湖亚相黑色泥页岩为研究区东南部的长9油藏提供油源供给;研究区长9储层主要为三角洲前缘水下分流河道砂体,物性显示长9整体为低孔、低渗储层;形成于印支期的裂缝和局部高渗砂带为研究区长9油气疏导体系;油藏类性主要包括构造—岩性油藏和岩性油藏两大类;发育上生下储和自生自储式两类成藏模式。结论为陕北地区延长组深部油气进一步勘探开发提供科学依据。
In order to analyze the hydrocarbon accumulation characteristics of Chang-9 reservoir in northern Shaanxi and summarize its hydrocarbon accumulation model, in view of the problems of reservoir elements and reservoir types to be clarified, core observation, casting thin sections, scanning electron microscopy, biomarker compound comparison and other methods were used to be studied in this paper. Those studies have drawn the following conclusions: The delta front and shallow lake sedimentary surfaces were mainly developed in Chang-9 formation in the study area. The black shale at the top of Chang-9 provides oil supply for Chang-9 reservoir in the study area. Chang-9 reservoir is mainly distributary channel sand body of delta front which physical property shows that Chang-9 reservoir is low-porosity and low-permeability. The fractures formed in the Indosinian period and the local high-permeability sand belt are the oil drainage system of Chang-9 reservoir in the study area. The reservoir types mainly include structural-lithological reservoirs and lithologic reservoirs. Chang-9 reservoir mainly develops two types of hydrocarbon accumulation models. It provides a scientific basis for further exploration and development of deep oil in the Yanchang formation in northern Shaanxi.
作者
马瑶
朱云龙
侯煜菲
郭懿萱
李文厚
Ma Yao;Zhu Yunlong;Hou Yufei;Guo Yixuan;Li Wenhou(School of Earth Sciences and Engineering,Xi'an Shiyou University/ Key Laboratory of Shaanxi Provincefor Oil and Gas Accumulation Geology,Xi'an,Shaanxi 710065,China;Research Institute of Exploration andDevelopment,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China;State Key Laboratoryof Continental Dynamics/ Department of Geology,Northwest University,Xi'an,Shaanxi 710069,China)
出处
《非常规油气》
2018年第5期1-7,共7页
Unconventional Oil & Gas
基金
国家自然科学青年基金项目“鄂尔多斯盆地南缘三叠系延长组优质烃源岩中碳酸岩的发现及其成因研究”(41702117)
国家自然科学重点基金项目“坳陷型富烃凹陷的主要特征和形成的动力学环境:以鄂尔多斯盆地为例”(41330315)
陕西省自然科学基础研究青年项目“渭河盆地油气地质条件及勘探潜力研究”(2017JQ4018)联合资助
关键词
成藏特征
长9油层组
延长组
陕北地区
鄂尔多斯盆地
hydrocarbon accumulation characteristics
Chang-9 oil reservoir
Yanchang formation
northern Shaanxi area
Ordos basin