层序地层学研究及隐蔽油气藏预测——以南阳凹陷古近系为例  

SEQUENCE STRATIGRAPHIC RESEARCH AND PREDICTION ABOUT SUBTLE POOLS

作　　者：程学峰[1] 于群达[2] 吴跃通[2] 孙峥嵘[2] 杨春红[2] 

机构地区：[1]中国地质大学,湖北武汉430074 [2]河南油田地质研究院,河南南阳473132

出　　处：《新疆地质》2003年第2期206-209,共4页Xinjiang Geology

摘　　要：高精度层序地层学已被证明是寻找隐蔽圈闭行之有效的理论方法.运用该理论对南阳凹陷进行了研究,对地震剖面中反射界面的追踪,在古近系中识别出了各级别的层序界面,结合周缘露头、钻井、测井等资料,分析了主要目的层序内体系域的构成及高频单元变化规律,建立了层序地层模式,在此基础上预测南部陡崖式断坡带和北部缓坡式弯折带是低位域砂体和隐蔽岩性油气藏形成的有利区带.Nanyang Depression抯 Brief Introduction and Research Way Nanyang Depression is a Cenozoic half-graben. Its important explored horizon is Paleogene抯 Hetaoyuan Formation. Now we have discovered four oil fields (Dongzhuang, Weigang, Zhangdian and Beimazhuang) . Its cumulative proven reserve is 1656×104t. Its cumulative oil-bearing area is 31.9 km2.According to the achievement of resource assessment, its total oil resource is 6200×104t. Its remaining reserve resource capacity is 4500×104t, the potential is relatively huge. But it has been exploited for 3o years. The exploration degree is very high and there are many difficulties. Many big structural traps have been explored. We must completely research seismic and geological materials in a systematic way in order to find oil how to accumulate and how to form pools, to guide new exploration areas. Therefore there is profound significance to do High Precision Sequence Stratigraphic research and prediction about subtle pools for the first time in the depression. 2 High Precision Sequence Stratigraphic Research (1) Research way and sequence division .By synthesizing outcrops, drilling, logging materials etc,and completely tracing reflection characteristic of seismic sections, we distinguishes every sequence of different grade, and divide high frequency sequences of the important horizon to study their construction and evolution laws. Main dividing evidence:① seismic reflection character analysis: uncomformity interface due to cutting or erosion, dipositional onlap ,baselap and top lap; ② core,cutting logging and well logging materials; ③ system tract evolution; ④organism species; ⑤microelement change.Because of its ancient landform, the construction characteristic of high frequency sequences in III grade sequences are controlled by the northern bend-sloping region. The region becomes a favorable site for the later exploration to look for big fan bodies in LST. (2) Depositional system analysis of the important explored horizon.There are three big depo

关 键 词：层序地层学 隐蔽油气藏 南阳凹陷 地震剖面 测井资料 成藏模式 

分 类 号：P618.13[天文地球—矿床学]