GRAVITY FLOW SEDIMENTARY CHARACTERISTICS AND THE SIGNIFICANCE OF PETROLEUM EXPLORATION IN THE CHALUHE FAULT DEPRESSION, THE YITONG BASIN
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摘要: 伊通盆地岔路河断陷始新统中发育大量水下重力流沉积,根据重力流发育位置及沉积特征,可划分为浅水浊流沉积、深水浊流沉积、水下滑塌沉积和水下泥石流沉积4种类型.通过对本区区域地质背景、钻井岩性、测井和地震等资料的综合研究,认为水下滑塌和水下泥石流沉积为再搬运和再沉积作用的产物,常与断裂相伴生;但浅水及深水浊流沉积常发育在前扇三角洲部位,大部分是由阵发性水下分流河道水流事件形成的,部分属于滑塌浊流二次沉积成因.油气勘探成果表明,研究区水下浊积砂体的储集物性普遍较好,并已有油气勘探突破,证实位于二号断层下降盘的梁家构造带和万昌构造带周缘的深水浊积砂体和浅水浊积砂体有着良好的油气勘探前景.Abstract: Lots of subaqueous gravity flow sedimentary bodies were developed in the Eocene strata of Chaluhe Fault Depression,the Yitong Basin.Based on the study of distribution and sedimentary character of gravity flow,four sedimentary types can be recognized: shallow-water and deep-water turbidity current deposits,underwater slide deposits and underwater debris flow deposits.Through the comprehensive analysis of regional geological background,drilling lithology,well loggings and seismic data,it is suggest that underwater slide deposits and underwater debris flow deposits were formed in re-transported and redeposition,which were usually associated with faults.Shallow-water and deepwater turbidity current deposits were developed in the pre-fan delta,and mostly related to the paroxysmal water flow event due to subaqueous distributary channel,and partially to the slump turbidity current redeposition.Based on the oil-gas exploration results,it shows that the turbidity sand-body has developed well reservoir capability and has a successful oil-gas exploration.It has been proved that shallow-water and deep-water turbidite sand bodies have good potentials for oil and gas exploration in this region,which are in Liangjia structural belt of the down-thrown side of the No.2 fault and in the periphery of Wanchang structural belt.
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