饶阳凹陷新近系油气成藏机理及成藏模式的分析研究.pdf

摘要本文综合利用地质、地球化学、地球物理等资料,采用现代油气成藏理论和方法, 对饶阳凹陷新近系油藏的地质特征、烃源岩特征、油气来源、成藏过程及成藏模式等进行了系统研究。在对新生代埋藏史和热史恢复的基础上,利用BasinMod软件对古近系烃源岩生烃史进行了模拟,得出Es3上段和Esl 5段烃源岩具有晚期生烃的特点, 二者分别在Ed末、Ng初进入低熟油阶段。通过精细油源对比,明确了新近系油藏与 EsI下、Es3上两套有效烃源岩的源藏空间对应关系。利用生长指数和古落差法,定量分析了留西一留北地区新近纪时期主要断裂的活动性。在此基础上,结合成藏时间及油藏分布层位,厘定了有效输导断裂的分布,即留西断阶带以西及留北地区的断裂为新近系油气垂向运移的有效通道。通过断面形态研究,结合典型油藏解剖,明确了断面优势运移通道与油藏空间分布的关系,预测了Nga有利区。泥岩声波时差法与实测压力相结合,对研究区的成藏动力进行了分析,研究表明洼陷内沙河街组地层发育超压, 剩余流体压力差为烃源岩排烃的主要动力。以油源对比和输导体系研究为基础,利用油气运移地化指标,明确了油气主要运移方向及路径。综合分析建立了四种新近系油气成藏模式:中央背斜带下生上储一垂向运移成藏模式;断阶带远源—侧向运移成藏模式;留北网毯式成藏模式;潜山输导成藏模式。关键词:油藏特征,油源对比,成藏过程,成藏模式,饶阳凹陷 Studies on thePool—forming Mechanism andModels ofNeogene Reservoirs inRaoyang Depression XuHaoqing(Investigation and Exploration ofMineral Resource) Directed Youlu Abstract Based on the data of geology,geochemistry and geophysics,adopting modem hydrocarbon reservoir generation theories and methods,this paper gives asystematic research on oilreservoir geological features,source rockcharacteristics,oil andgas source, petroleum accumulation proce§sand on therecovery ofburialhistoryand geothermal history inNeogene,the hydrocarbon generation of source rock issimulated, and itis concluded thatsuper Es3and lower EslSOurCe rocks have characteristics oflate hydrocarbon generation:respectively generate lowmature oil inthe lateofEdepoch and early ofNg on detailed oil—SOurCecorrelation,the relationship between mature source rockandNeogene oil reservoirs faultgrowth indexand faultfall,thispaper quantitatively analyzes theactivity ofmajor on bined丽t11 thetimeofhydrocarbon accumulation and reservoir distribution strata, thedistribution ofeffective faultsisconfirmed which distributesinthe west region of step—fault zone researching fault-bined with dissection oftypical oilreservoirs,the relationship between fault section dominant migrating channel and space distribution of oilreservoir isillustrated,meanwhile, fa