| Focused on Archaean fractured reservoir of metamorphic rock in the Damintun depression of Liaohe basin, by the newly studied methods, the author predicts fractures in buried hills by drilling, coring, well logging and seismic data intergrately. Firstly, well logging responses of fractured reservoir have been worked out by using rock core to calibrate well logging data. Secondly, with the help of the seismic coherence cube, 3D volume visualization, seismic multi-attribute parameter, the curves of geophysical characteristics restructed, seismic data inversion with well logging restrict, the well curves inversion and so on, much work has been done, such as the full 3D seismic data fine structure interpretation and the studies for predicting the fractured reservoir in buried hills. A technique has been invented to predicting the fractured reservoir of metamorphic rock in buried hills with the integration of the multi-attribute and the multi-parameters. Based on those, the traps are evaluated and the well sites are planned, and the important breakthrough has been obtained by drilling.1 . in fractured reservoir, the spaces and the paths of reserving and percolating for oil and gas are mainly structural fractures. The forming and distribution of the structural fractures are related to the local tectonics (e.g. the rifting and the folding). The fractured system is very advantageous to the reserving and the percolating for oil and gas, which is formed by stacking of the regional fracture and the structural fracture,2. The mainly reservoirs in the middle of Damintun depression of Liaohe basin are the regional metamorphic rocks and the migmatites, which are more fractured and rigid by the cataclastics. The space of metamorphite is the mainly fractures, which are produced by the tectogenesis and the physical weathering. The space produced by the crystallization is the second. The pores and the fractures, which have been remade by the chemical dissolution, are more favourable for the oil and the gas to store up. The main factors influenced fractures development are the tectogenesis, the physical weathering and the chemical dissolution. The reservoirs, which are more fractured and cataclasm, are mainly distributed in fracture belt or near it. That is, the distribution of metamorphite reservoirs is influenced by the structural fracture belts. It is put forward further more that the fracture belts of lower buried hills are the favourable exploration targets.3. The response of Dual-laterolog Resistance Log for different angle fractures has been simulately computed by use of the finite element method. The fracture belts in drilling cross section are identified with the porosity logging and the Dual-laterolog method. When basement rock rupture pass through the well cross section, the fracture belts can be identified with some evidences, for example, the compensate neutron increasing and the stratum density diminishing synchronization, the dual-laterolog resistance diminishing greatly and the positive difference between the deep laterolog resistance and the shallow laterolog resistance appearing. When the compensate neutron increase, the stratum density diminishingand the dual-laterolog resistance value diminishing slightly, the fracture belts can be confirmed with the intrusive vein at high frequency in well cross section.4. The techniques and the principles of full 3D structural interpreting and the buried hill fracture predicting have been studied exploringly. The reservoir fractures of the metamorphic rock can be predicted using the seismic coherence cube and the seismic inversion technique. The series of techniques are formed. The beneficial technical methods and means in the field are provided for future.5. The method of predicting the fractured reservoir with the integration of the multi-attribute and multi-parameter is provided through studying. The method has been used in the middle of Damintun depression of Liaohe basin and got well drilling result. The 4 fault-block traps are found recently, such...
|
PDF Full Text Request