CAJ | 학술논문

四川盆地飞仙关组台缘鲕滩气田的发现,激励了人们重新认识台内鲕滩的发育分布规律及其勘探前景.根据野外露头及钻孔资料的分析,认为四川盆地南部飞仙关组一段的台内鲕滩具有发育向上变浅序列、单滩体厚度一般小于3 m、横向连续性较差的特征.着重分析了沉积期古地貌、古水深、海水动荡程度以及古海平面相对升降变化对台内鲕滩的控制作用,并把滩体的发育阶段分为雏滩期(低速建造期)、滩核期(高建造期)及衰亡期3个阶段.结果表明,在缓慢等效的海退过程中,处于高能沉积界面附近的水下古高地有利于台内鲕滩的形成,继承性的泸州古隆起核部是区内有利的滩体发育区,形成的台内滩体具有一定的厚度规模和较大的分布面积.这一认识可为该区飞仙关组台内鲕滩的下一步勘探提供必要的地质支持.
사천분지비선관조태연이탄기전적발현,격려료인문중신인식태내이탄적발육분포규률급기감탐전경.근거야외로두급찬공자료적분석,인위사천분지남부비선관조일단적태내이탄구유발육향상변천서렬、단탄체후도일반소우3 m、횡향련속성교차적특정.착중분석료침적기고지모、고수심、해수동탕정도이급고해평면상대승강변화대태내이탄적공제작용,병파탄체적발육계단분위추탄기(저속건조기)、탄핵기(고건조기)급쇠망기3개계단.결과표명,재완만등효적해퇴과정중,처우고능침적계면부근적수하고고지유리우태내이탄적형성,계승성적로주고륭기핵부시구내유리적탄체발육구,형성적태내탄체구유일정적후도규모화교대적분포면적.저일인식가위해구비선관조태내이탄적하일보감탐제공필요적지질지지.
The discovery of gas fields of oolitic bank on the platform edge of the Feixianguan Formation in the Sichuan Basin, encourages people re-recognizing the development and distribution regularity and exploration prospect of the intraplatform oolitic bank. This paper taks the using outcrops and borehole data, summarized the features of the bank on the platform in the Member 1 of Feixianguan Formation in southern Sichuan Basin as follows: the shoaling-upward sequence of the intraplatform oolitic bank, the thickness of a single bank is less than 3 m, the horizontal continuity is relatively poor. After further analyses and discussion, the authors proposed the development and distribution of the oolitic banks within the platform were controlled by the depositional palaeogeomorphology, water depth, turbulence of sea water and fluctuation of sea level, and divided the development of bank into three stages: the young bank time (low speed construction time), bank nuclear time (the high construction time) and the decline phase. The results show that the Luzhou Palaeohigh is the favorable region to develop the intraplatform oolitic bank during the slow equivalent regression process, moreover, the bank formed was characterized by a large thickness and wide distribution area. This recognition provides necessary geologic support for further exploration of oolitic bank on the platform.