鄂尔多斯盆地延长组浊积岩特征及其影响因素  

Characteristics and Controlling Factors of Turbidites in Yanchang Formation,Ordos Basin

作　　者：张世懋[1] 丁晓琪[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059

出　　处：《测井技术》2011年第6期594-598,共5页Well Logging Technology

基　　金：国家自然科学青年基金项目(40602012)鄂尔多斯盆地晚三世延长期几个关键性事件沉积及其与油气聚集关系研究

摘　　要：鄂尔多斯盆地延长组浊积岩成藏条件优越,是油气勘探的重要目标接替区。在坳陷型湖盆中寻找浊积岩,在对其特征进行详细认识的基础上重点研究并总结出浊积岩发育的控制因素。利用实测野外剖面、常规测井、电阻率成像等资料的解释分析方法,对延长组浊积岩及其相关地层的岩性、结构、构造等特征进行了观察总结,结合已知的浊积岩分布规律,认识了延长组浊积岩的形成机理及影响因素。该区浊积岩的发育主要受地震、洪水等动力机制的影响,受物源供给、气候条件、斜坡坡度、底形迁移等环境条件的制约,秦岭造山运动间接控制了浊积岩发育的动力机制与环境条件。盆地西南缘长7段与长6段三角洲前缘的半深湖-深湖环境中具有浊积岩分布的条件,下一步勘探应该重视华池-庆阳-宁县一带。In Yanchang formation, Ordos basin, accumulation condition of turbidites is superior, so it is a very important target area for oil and gas exploration replacement. However, to find turbidites in depression basin, first, we should make a detailed understanding of its characteristics, then focus on study of controlling factors of turbidites. By measuring the field profiles, analyzing data of conventional logging and FMI, we have observed lithology, structure, conformation and other characteristics of the turbidite, in Yanchang formation. Combined with distribution of turbidites that we had known, we have recognized the origin and controlling factors of turbidites in Yanchang formation. Origin of turbidites in this area is earthquakes and floods. Distri-bution of turbidites is controlled by source supply, climate, slope gradient and migration of basin bottom. Dynamic mechanisms and environmental conditions of turbidites development are indirectly controlled by Qinling orogenic. The results show that in southwest of Ordos basin, the deep-semi-deep lake which in front of fore-delta in Chang7 and Chang6 formation have conditions for the distribution and formation of turbidites, further exploration should be Huachi--Qingyang --Ningxian area.

关 键 词：测井解释 浊积岩 形成机理 影响因素 延长组 鄂尔多斯盆地 

分 类 号：TE122.222[石油与天然气工程—油气勘探] P631.81[天文地球—地质矿产勘探]