渤中凹陷南部火成岩体精细雕刻及火山喷发模式研究

Fine Engraving of Eruptive Bodies and Study on Volcanic Eruption Model in Southern Bozhong Sag

渤中凹陷南部火成岩极为发育,其大面积分布严重影响了地层、断裂的解释,进而制约了对凹陷形成、演化及石油地质条件的认识。针对渤中凹陷火成岩形态刻画较为薄弱的问题,根据现有资料,创新提出一套适用于该区乃至其他类似的无井、少井区火成岩体精细雕刻"4步法",并运用该方法完成了整个渤中凹陷南部火成岩体及火山通道的识别及精细雕刻。研究结果表明:该区火成岩主要分布于东营组及馆陶组地层中;发育有"中心式"和"裂隙式"2类火山喷发模式。该研究首次对渤中凹陷的火成岩进行精细雕刻,为下一步针对渤中凹陷内部的勘探工作提供新的方向。

Volcanic rocks are much developed in southern Bozhong sag. The extensive distribution of the volcanic rocks seriously affected the interpretation of formations and faults, then restrained our cognitions on the formation evolution and petroleum geology conditions of this sag. Aiming at the problem that the volcanic rock form description is relatively weak in the Bozhong sag, based on available data, we innovatively proposed a set of u four-step meth- od＂ to finely engrave the eruptive bodies in this area and other similar areas without or with fewer wells, and ap- plied this method to identify and finely engrave the eruptive bodies and volcanic conduits in the whole southern Bozhong sag. The study results show that： （ 1 ） the eruptive rocks in this area are chiefly distributed in the Dongying Formation and the Guantao Formation ; { 2 } it develops two types of volcanic eruption models （ central type and fracture type ）. This study finely engraved the eruptive rocks in the Bozhong sag for the first time, and provides new direction for exploration in the Bozbong sag.