摘要
根据界面组构特征、延伸范围、侵蚀程度及间断期限 ,西昌复合盆地共识别出特级 (3个 )、超级 (4个 )、Ⅰ级 (3个 )、Ⅱ级 (2个 )、Ⅲ级 (7个 )、Ⅳ级 (5 9个 ) 6个级别类型的层序界面 ,共 78个 ,不同级别类型的层序界面 ,其组构、特征及分布各异。在此基础上 ,结合构造活动、盆地性质、盆山转换、海平面变化等 ,将西昌复合盆地 78个层序界面归结为造山侵蚀、升隆侵蚀、陆上侵蚀、暴露溶蚀、水下间断、海侵上超等 6种成因类型 ,不同成因类型界面其形成背景、成因机理明显不同。在层序界面级别类型及成因机理研究成果基础上 ,通过对层序界面与地层划分、盆地演化及油气储层关系的初步研究表明 ,层序界面不仅在油气勘探中发挥重要作用 。
Based on such factors as boundary texture, extension, erosion and cessation of deposition,6 grades of sequence boundaries have been recognized in Xichang Basin,which include 3 mega order,4 super-order,3 Ⅰst order, 2 Ⅱnd order,7 Ⅲrd order,and 59 Ⅳth order boundaries.Different grades of sequences show different textures, characteristics and distributions. On such a basis in conjunction with tectonic and basin natures, basin-mountain transformation and sea-level change, 78 sequence boundaries in Xichang Basin can be grouped into 6 sorts of genetic types, namely, orogenic erosion, elevation erosion, subaerial erosion, exposed erosion, transgressive overlapping, and submarine cessation, of which each possesses its own formational background and mechanism. Furthermore, the relationship between the sequence boundary with strata division, basin evolution and petroleum reservoir has also been investigated in detail. It is revealed that the sequence boundary plays an important role not only in petroleum exploration but in the solution of such problems as strata surface and basin analysis as well.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2003年第2期143-150,共8页
Acta Geoscientica Sinica
基金
四川省杰出青年基金项目"西昌盆地层序充填动力学与油气勘探研究"项目的一部分
