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加蓬×区块钻遇的最老地层是上白垩统,自下而上分为Azile组、Anguille组、Pointe-Clairette组及Point-Gentile组。上覆新生界主要分布于工区的西南部,地层比较齐全,工区东北部大部遭受剥蚀。Anguille组为半深海相泥岩夹粉细砂岩,分布全区,是主要的产油层之一。Pointe-Clairette组按岩性划分为上下两段(上PC段和下PC段),它们也是重要的产油气层。工区存在上白垩统Azile组和下白垩统Madiela组,N′Toum组三套烃源岩。区域盖层主要包括Anguille组和下PC段的海相泥岩;下白垩统盐岩也是一套十分优质的区域盖层。工区有四套储盖组合,主要为自储自盖和下储上盖。油气藏类型有(断裂)背斜油气藏、断裂鼻状构造油气藏、断块油气藏等。已有8口井在上、下PC段和Anguille组获得工业油气流,控制含油面积5.4km2,石油地质储量352.1×104t,预测含油面积26.4km2,石油地质储量4102.8×104t。在上、下PC段和Anguille组等三个地层中共识别出构造圈闭62个,圈闭总资源量约5×108t。
The oldest formations encountered in the Gabon × Block are Upper Cretaceous and are divided into Azile, Anguille, Pointe-Clairette and Point-Gentile from bottom to top. The overlying Cenozoic mainly distributes in the southwestern part of the work area. The stratum is relatively complete and most of the northeastern part of the work area is eroded. The Anguille Formation is a semi-deep marine mudstone with fine sandstone, distributed throughout the region and is one of the major oil-producing formations. The Pointe-Clairette Formation is lithologically divided into upper and lower sections (upper PC section and lower PC section), which are also important oil and gas producing layers. There are three sets of source rocks in the work area including the Upper Cretaceous Azile Formation, the Lower Cretaceous Madiela Formation and the N’Toum Formation. The regional caprocks mainly include marine mudstones of the Anguille Formation and the lower PC section. The Lower Cretaceous salt rock is also a very high-quality regional caprock. Working area has four sets of storage cover combination, mainly from storage and storage under the cover. The types of reservoirs include (fractured) anticline, fractured nose structural reservoirs and fault block reservoirs. Eight wells have obtained industrial oil and gas flow in the upper and lower PC segments and the Anguille Formation. The controlled oil-bearing area is 5.4km2, the petroleum geological reserves are 352.1 × 104t, the predicted oil-bearing area is 26.4km2 and the petroleum geological reserves are 4102.8 × 104t. In the upper and lower PC segment and the Anguille Formation, there are 62 structural traps and traps totaling about 5 × 108t.