在古近系复杂沉积动力条件下,惠州26-6构造形成了复杂的规模性砂砾岩沉积体,并持续伴有强烈的火山作用和伴生物质,导致潜山界面岩性非常复杂。目前对于潜山储层复杂岩性的系统性研究较少,且潜山界面的卡取与预警也是棘手问题。为了精准区分潜山储层复杂岩性,以及准确卡取潜山界面并减少工程事故,利用元素录井资料对潜山复杂岩性（主要是火成岩,包括闪长岩、花岗岩、辉绿岩）及进山模式进行了研究。研究表明,惠州26-6构造主要元素包括7种（Si、Al、Fe、Mg、K、Na、Ca）,针对潜山主要岩性火成岩,Si与Fe、Si与Mg、Si与Ca、Si与K这4个图板的区分效果较好。惠州26-6构造存在两种进山模式：一种为先进入闪长岩裂缝发育带,随后进入花岗岩基底,该模式存在亚类,其闪长岩裂缝发育带顶部风化壳发育一小段花岗岩侵入体,与基底花岗岩特征元素变化一致,但Si、Al元素存在差异,风化壳Si、Al元素含量略高;另一种为直接进入花岗岩基底。前者进入闪长岩裂缝发育带时,元素特征为Si、K、Na元素含量降低,Fe、Mg、Ca元素含量升高,再进入花岗岩基底时,Si、K、Na元素含量升高,Fe、Mg、Ca元素含量降低。后者的元素特征直接表现为Si、K、Na元素含量升高,Fe、Mg、Ca元素含量降低。

Under the complex sedimentary dynamic conditions of the Paleogene,the Huizhou 26-6 structure formed a complex large-scale glutenite deposit body,which was continuously accompanied by strong volcanism and associated materials,resulting in very complex lithology of the buried hill interface. At present,there are few systematic studies on the complex lithology of buried hill reservoirs,and the stuck and early warning of buried hill interfaces are also thorny issues. In order to accurately distinguish the complex lithology of buried hill reservoirs, as well as stuck buried hill interfaces to reduce engineering accidents,element logging data are used to study the complex lithology of buried hills, mainly igneous rocks,including diorite,granite,limestone and the mountain entry mode. Research shows that the main elements in Huizhou 26-6 structure include seven elements： Si,Al,Fe,Mg,K,Na,and Ca. For the main lithology of igneous in the buried hills,the four maps Si-Fe,Si-Mg,Si-Ca,Si-K have good distinguishing effects. There are two types of mountain entry modes in Huizhou 26-6 structure: one is to enter the diorite fracture development zone first and then enter the granite basement; the other is to enter the granite basement directly. The first type is when entering the diorite fracture development zone,its element characteristics are that the content of Si,K and Na elements decreases,and the content of Fe,Mg and Ca elements increases. There are subtypes in this mountain entry mode. There is a small granite intrusion developed in the weathering crust at the top of the diorite fracture development zone,which is consistent with the characteristic elements of the basement granite,but the Si and Al elements in the weathering crust are slightly higher. When entering the granite basement,the contents of Si,K,and Na elements increase,and the contents of Fe,Mg,and Ca elements decrease. The elemental characteristics of the second type are as follows： the content of Si,K,and Na elements increases,and the content of Fe,Mg,and Ca elements decreases.