黄河口凹陷岩浆底辟构造地震响应特征及发育模式

Developmental seismic response characteristics and model of magmatic diapir structure in Huanghekou depression

为研究黄河口凹陷岩浆底辟构造油气成藏规律和发育模式,根据底辟构造模式和理论,利用钻井和高精度三维地震资料,研究岩浆底辟构造的成因、地震响应特征和发育模式,分析岩浆底辟构造与油气成藏的关系.结果表明,黄河口凹陷发育2次以裂隙式喷发模式为主的岩浆喷发活动,不同的火山岩亚相(火山通道相、火山口相、侵入相、溢流相和喷发相)具有特定的地震响应特征.此外,黄河口凹陷岩浆底辟构造的发育模式及其成藏规律与其他地区的存在较大差异,该区岩浆底辟构造主要为岩墙遮挡性质的鼻状构造和岩上断层控制的断块构造,发育程度控制油气的运移和聚集.该成果有利于指导黄河口凹陷火山岩发育区的油气勘探.

Diapir structure is the important type of the hydrocarbon accumulation.Taking the magmatic diapir structure at southern slope of Huanghekou sag for the study object,based on the analysis of magmatic diapir developing model and reservoir forming rule,using the results of comprehensive analysis of log-seismic data and high precision seismic data,we analyzed and studied the forming case of magmatic diapir,feature of seismic response and developing model,and the relationship of the magmatic diapir with hydrocarbon accumulation.The result shows that the block developed two times of magmatic exhalation.Different subfacieses of volcanic rock(volcanic channel facies,volcanic crater facies,invasion facies,effusive facies,and eruptive facies)have the specific seismic response characteristics.Furthermore,magmatic diapir developing model and reservoir forming rule in this block has some unique features.As the conclusion,magmatic diapir structure is a nose structure block shielded by dike and controlled by superior petrosal fault,and the developing degree controls the hydrocarbon migration and accumulation.Therefore,the study of the seismic response and developing model of diapir structure is helpful to guide the hydrocarbon exploration of volcanic area in Huanghekou sag.