南阳凹陷层序地层学研究  

A study of sequence stratigraphy at Nanyang depression.

作　　者：付志方[1] 张本书[1] 昝新[1] 许胜利[1] 林正良[1] 

机构地区：[1]中国石化河南油田分公司勘探开发地质研究院,河南南阳473132

出　　处：《石油物探》2004年第3期283-287,共5页Geophysical Prospecting For Petroleum

摘　　要：通过对南阳凹陷层序地层的研究,综合应用地震、测井、岩心及其它分析化验结果,划分出一级层序界面3个、二级层序界面3个、三级层序界面7个. 针对该区主要目的层核桃园组,在三级层序内又进一步细分为多个高频层序单元,且把其分别归属到低位域、湖扩展域和高位域等3种不同的沉积体系域内.结合该凹陷沉积体系的空间变化规律及凹陷演变过程中的构造变化,建立了南阳凹陷的层序构成模式,明确指出南阳凹陷南部断坡带和北部弯折带控制的低位域区为南阳凹陷寻找低位域砂体或隐蔽岩性油气藏的有利目标区.经实钻验证,新增控制地质储量超过500×104 t.In the study of high resolution sequence stratig- raphy at Nanyang depression, we have identified three boundaries of the first-class sequence, three boundaries of the second-class sequence, and seven boundaries of the third-class sequence. In the target interval of Taoyuan formation, more sequence units are identified in the third-class sequence. and tied to 3 system tracts: HST (high system tract), LST (lower system tract) and EST (expanded system tract), respectively. The sequence configuration of the Nanyang depression is established according to the spatial variability of the sedimentary system and the tectonic changes in the course of depression evo- lution. It is concluded that the LSTs at the southern faulted ramp and the northern deflected zone in Nan- yang depression are favorable areas for subtle lithol- ogical reservoirs. Drilling demonstrates that the new- ly increased probable reserves exceed 500×10~4 t.

关 键 词：南阳凹陷 层序地层学 岩性油气藏 构造圈闭 反射结构 

分 类 号：P618.13[天文地球—矿床学]