河北黄骅坳陷沈家铺地区孔一段火成岩油气特征

Hydrocarbon Characteristics of Igneous Rock of the First Member of Kongdian Formation in Shenjiapu Area of Huanghua Depression, Hebei

根据地震剖面解释 ,结合岩芯观察、钻井、测井及试油等资料 ,从火成岩的岩性、电性特征 ,火成岩空间分布特征、储集特征及其含油气特征等方面 ,对沈家铺地区孔一段火成岩的分布规律及其油气特征进行了研究。该区主要发育火山喷发岩和浅成侵入岩 ,它们分别分布于孔西断层的下降盘和上升盘 。

We studied the factors of controlling the formation of igneous oil bearing reservoir and analysis the law of oil gas accommodation in Shenjiapu area of Huanghua Depression. In order to do so, according to interpretation of seismic sections and core analysed, drilling,logging and oil testing data explanations to igneous rock, we had studied the distribution law and hydrocarbon characteristics of igneous rock of the first member of Kongdian Formation(Ek 1) in the area, such as the property of petrography and geophysics,spatial distribution,reservoir characteristics and oil and gas bearing of igneous rock. The conclusions are as follows: (1) Shenjiapu area is divided into two parts by Kongxi fault. In the downthrow block effusive rock developed and in the uplifted wall intrusive rock developed. The distribution and thickness of effusive rock is larger than intrusive rock. (2) The igneous reservoir had undergone five diagenetic stages: cooling diagenesis, filling of chlorite, filling and replacement of calcite, forming of structure fracture and corrosion of cement. And during these stages two kinds of reservoir space, pore and fracture, were developed. (3) There are many igneous oil bearing sequences and two kinds of oil and gas pools in the research area. The first one is oil and gas of volcanic rock in which the reservoir space of igneous rock was mainly composed of pore and fracture, and was developed in the first and second submember of Ek 1 in the downthrow block of Kongxi fault. The second one is oil and gas of hypabyssal intrusive rock in which fracture was the main reservoir space, and was developed in the third and fourth submember of Ek 1 in the uplifted wall of the fault. (4) The formation of igneous oil bearing reservoir in the research area were controlled by the rock type of reservoir, modified degree of rock caused by the tectonic movement and the position of structural high.