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

ZHANG Shi-qi1, JI You-1iang1, SHI Zhan-zhong2   

  1. 1. Department of Petroleum Resources Science, University of Petroleum, Shandong Dongying 257061, China; 2. Academy of Geological Science, Dagang Oil-field, Tianjing 300280, China
  • Received:2001-12-20 Revised:2001-12-20 Online:2001-12-20 Published:2001-12-20

Abstract: 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(Ek1)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 Ek1 in the downthrow block of Korgxi 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 Ek1 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.