The Research Of The 2D Seismic Acquisition Project On Haimi-Luosi Block

The 2D seismic exploration programe of HaiMi-LuoSi is a seismic acquisition research project deployed in BaChu by northwest branch company of SINOPEC during 2007-2008. There is a 2D seismic acquisition overall deployment which carry on the pcocess of the 4×8km grid densities, 18 lines in all,full cover 726.9 KM,design 22305 shots in the area,in order to investigate LUOSITAGE closure,implement the distribute of the layer,the structure situation and the split distribute,discover and fulfill the closure,carry out the target evaluation. It is complicated,covered by the desert in the surface of the work area.covered by the surface of the work area,and stretches endless by the compound sand mountain, the extent of dunes,almost half fixed dunes, sand mountain.HaiMiluoSiTaGe mountain is the highest point in the work area, the third series is exposed.It is a dry desert,no natural vegetation,fluid wildly blew by wind in the surface of work area.The area upheaval is located in the northwest of Talimu basin, on the border of Kepin split upheaval in the north, conterminous with Awati dent in the northeast,connected with Tanggubasi dent,on the border of the Maigaiti brae in the north.The area structure upheaval is a large back-lash split upheaval,held between Aqia-Tumuxiuke fracture zone and Mazhatake fracture zone.The structure now is divided into East,West segments on geometry shape,the west segment stretches with NNW direction,the east segment stretches with NW direction,is a situation of two bulgy surrounded with one sunken,means Luositage -bird mountain-Mazhatage structure strip in the bride of south,a large wide-gentle Gudong mountain-Kalashayi slide structure strip in the middle and Tumuxiuke structure strip in the bride of north.Haimi-Luosi structure strip alteration is controlled by the area struceure as a part of the area structure upheaval.The devonian system depletes, the silurian system depletes as a part in the Mesozoic(K,J,T) of Luositage,Gudong mountain. The split slope in the deep leans, wave source is complicated, seismic acts as photo difficultly, especially Luositage north spilt,the position of Gudong mountain is a zone which is hardest to get data result in that the dope reflection is weak and the surface of the earth is complicated. The block seismic exploration extent is very low result in complicated earth surface,structure in the deep and the restriction of seismic exploration equipment. The seismic acquisition condition before 2004 is not clear, the shot is mainly adopted in shallow wells combination and the seismic data quality is very bad.Much difference existed in the lithology and density of the area's stratum in every era, develops many obvious waves resist the interface, the split slope in the deep leans, wave source is complicated, the seismic acts as photo is difficult, especially Luositage split strip is a zone which is hardest to get data result in that the dope reflection is weak and the surface of the earth is complicated. According to the seismic section plane previously, seismic data quality is too bad, the geology wave group reflection is not clear. The whole section plane quality is excellent, the signal noise is very high, the reflection wave group is well-founded, the structure phenomenon is very clear according to the BC07-204SN first step processing data in Talimu seismic deep research line in 2007.The reflection is continuous, the energy is strong,the breakpoint is clear in the position of Luositage structure's two sides;But the reflection signal noise is still very weak,the reflection wave group character,contact relationship and breakpoint is not clear,the main structure position which acts as photo is very bad inside Luositage split and can not afford to the necessity of geology explanation. It's the area technique crux mainly performed shallow layer energy to be shielded, the main part of the structure is complicated, the photo acts difficult, the main purpose reflection layer's energy is weak and the statics correction problem caused by the complicated eaarth surface condition.This project assure shottong at a high speed layer at the body of the mountain;It is a method assured shotting 7 meters below water table in the desert, using short distance between two receive points, long arrays, more cover times, improve space sample rate highly and valid cover times of purpose layer.In the meantime, follow strictly the work method of "point experiment- experiment line- test experiment during the production course", adopt the way micro-survey-well and measure the water table combined getting low-fall-speed data generally and preciously, calculate the stactis correction adopting model way in whole area, confirm the method of stactis correction correctly in the end after the superimpose processing experiment, and restrict the calculation adjust quantity using the surface layer structure data ofmeasure well and dive noodles measure investigate of micro-survey-well and the water table measurement investigate,improve the precise of the stastics correction.During the project, assured every shot is test shot, every line is also the precious operation in the test line, obtain a good effect, valid wave energy is getting stronger, reflection layer is more abundant, underground structure can be implemented through the research on Luositage mountain and more bigger sand mountain.The reflection is contious,the energy is strong,the breakpoint is clear in the south side structure top of Luositage;The reflection is not absent,the signal noise is high between the north of Gudong mountain structure and the south of Kalashayi split.The underground reflection wave group energy is strong,wave group is contious very well,the signal noise is very high,the section plane character is pure,overall quality is better,shallow,middle,deep reflection group character is clear,the valid reflection energy is strong,contiousity is good in the south dune section plane. Luositage section plane manifestate that underground reflection wave group energy is strong,the shallow layer reflection group contiousity is bad by the influence of the earth surface condition;The signal noise of the main purpose layer is high,the information between layers is andundent. Eventually complete 18 lines, full cover length 743.39 KM, 22230 shots.All section planes complete geology mission very well, and discover a nose-form structure, make a great contribution for the acquisition breach in the area, and get the lesson and instruction the same as the work area.