Study On Geology Transformation System And Pool-forming On The Clastic Rock In Palaeozoic In Tarim Basin

The changes of the accommodation is non-unit during the basin evolution, so during the basin evolution, there is a balance point (zone), on one side of which the accommodation is additional and the other side is reductive, the accommodation is relative stable at the balance point. Geology transform system developed from the non-unity studying of accommodation, it is mainly studying accommodation changes and trying to find the relative sustained zone– geology transform zone.According to the tectonic evolution stage, sedimentation and the period of the geology transform zone formation the geology transform zone is divided into synchronous period transform zone and non-synchronous period transform zone in this paper.The sync transform zone is this kind of zone formed during sediment period, and on both sides the accommodation change are different and on one side of which denudation occur and the other side sedimentation occur under the unity of the ascent and fall of absolute level, so its significance is that that the boundary of sediment and denudation could be formed identified, synchronous period transform zone control the development of sequence and deposition, so it control the reservoirs and the formation of original pool and secondary pool.The non-sync period transform zone also called structure supporter, it is caused during the structure change for the tectonic movement, its is also a accommodation transform zone. and on both sides the accommodation change are different. On one side of which uplift occur and the other side sinking occur that caused by the tectonic movement. so its significance is that the boundary of uplift and sinking could be formed identified, non-synchronous period transform zone control the adjustment of the oil & gas in the former pool,it have great influence to the formation of original remains pool and secondary pool.On the basis of the geology data, the north slope of Tazhong zone and Hadexunpool in Tabei zone were studied in this paper: the pool-forming period, the relation of pool-forming control factors, the characteristics of oil & gas distribution and the geology transform system was studied. That the geology transform system has great influence to the forming and later adjustment was studied.The pools of S-D in Tazhong area are mainly original pool and original remains pool, and the pools in Tabei area are mainly original remains pool and secondary pool. The original pools and some original remains pools formed and distributed along the sync transform zone, but the secondary pools and some original remains pools formed and distributed along the sync transform zone, the geology transform zone have great influence to the formation, adjustment and it also control the adjustment, sub- distribution and the forming of the secondary pool.On the base of the above study, the pool forming models in S-D caused by geology transform were set up, and according to the models, the potential oil and gas prediction orientation was brought forward.