塔中围斜区碎屑岩储层火成岩侵入体预测

Predictiou for igneous intrusive mass of clastic reservoir in the pericline area around central Tarim basin

1. 成都理工大学,四川成都610059;2. 中国石油化工股份有限公司石油勘探开发研究院南京石油物探研究所,江苏南京210014

Chengdu University of Technology Chengdu 610059 China

塔中围斜区主要分布有上泥盆统东河砂岩、志留系碎屑岩储层,以及中、下奥陶统碳酸盐岩储层。其中东河砂岩段和志留系下砂岩段是塔中地区碎屑岩储层最具勘探潜力的目的层系。但塔中地区特别是塔中隆起西部的卡1区块二叠系火成岩分布广泛,且火山口密布。古生代强烈的岩浆岩活动一方面构成了对塔中地区原始油气藏的破坏作用,另一方面也可形成与岩浆岩有关的新圈闭类型的油气藏。针对塔中围斜区火山岩发育的实际状况和碎屑岩储层预测的需要,利用卡1区块三维地震资料,采用三维地震不连续性检测技术成功地预测了工区内目标储层火成岩侵入带、火成岩侵入通道的分布及火成岩侵入的地层,识别出了不同火成岩侵入体在切片图上的异常形态,及其在剖面图上的异常特征和对应的地震反射特征。研究结果表明,利用三维地震不连续性检测技术全方位预测目标储层内火成岩侵入体的形态及其分布,可望为塔中围斜区地震资料的精细解释和碎屑岩目标储层的横向预测确立一项实用有效的技术手段。

The clastic rock reservoirs of Upper Devonian and Silurian and the carbonate reservoirs of Middle and Lower Ordovician are mainly distributed in the peri-cline area around central Tarim basin.The Donghe sandstone member of Upper Devonian and the lower sand-stone member of Silurian are the most potential exploration targets in this area.In the central Tarim area,especially the Kal block in west Tazhong uplift,the igneous rock of Permian and craters are widespread,which means that the strong igneous rock activities of Paleozoic has a katogene on original oil/gas accumulation in central Tarim basin,but it may form a new trap of oil/gas accumulation. Aimed at the actual development of igneous rock and the needs for clastic reservoir prediction in the peri-cline area around central Tar-im basin,by using 3-D seismic data in Kal block,the 3-D disconti-nuity detecting technique is adopted tosuccessfully predict the igne-ous invasion zone,the distribution of the igneous invasion passage-way and the igneous invasion formation in the target reservoirs and to recognize some features of different igneous rocks,such as ab-normal form on slice chart,abnormal characteristics on sections and its relevant seismic reflection characteristics.The results show that utilizing the 3-D seismic discontinuity detecting technology to have a comprehensive prediction of the distribution and the shape of igneous intrusive mass quite possible to establish a practical effec-tive technical method for a detail interpretation of seismic data and the transverse prediction of target clastic reservoir in the peri-cline area around Central Tarim basin.