东营凹陷各构造区带下第三系成岩演化与次生孔隙发育规律研究

RESEARCH ON DIAGENETIC EVOLUTIVE SUCCESSION AND OCCURRENCE OF SECONDARY POROSITY OF LOWER TERTIARY IN DIFFERENT STRUCTURAL BELT OF DONGYING DEPRESSION

在研究东营凹陷各构造区带成岩系列和成岩特征的基础上,分析了各构造区带次生孔隙发育的特征和分布,探讨了影响各区带次生孔隙发育的主要原因,总结了各区带次生孔隙的基本发育规律。认为影响各构造区带次生孔隙发育的共同因素为有机质产生的羧酸和CO2、粘土矿物转化过程中释放出的H+;各构造区带的其他影响因素不尽相同,北部陡坡带主要与大气水渗流、不整合面和深部地层水上升有关,南部缓坡带则主要与不整合面有关,中央隆起带则与深部地层水上升有关,洼陷带则受异常高压场的控制。

Based on the study of Tertiary diagenetic evolutive successive and diagenetic characteristics in Dongying depression, the zone numbers of secondary porosity and their depth ranges of all the structural belts have been pointed out, the major controlling factors on secondary porosity are analyzed and the occurrence of secondary porosity in each structural belt are summarized in this article. Humic acids and carbon dioxide generated from matured organic matter (part of carbone dioxide from inorganic matter)and H^(+) coming from clay minerals' transition are the general factors, but there are also the additional factors in different structural belt: in northern steep slope area, they are mainly meteoric water and formation water coming from deep; in southern gentle slope area, referring to unconformity;in central uplift area, formation water coming from deep; in sag, abnormal overpressure.