CAJ | 학술논문

鄂尔多斯盆地南部延长组长8-长6油层组沉积相为曲流河三角洲-半深湖、深湖，重力流沉积发育。以前认为这些重力流沉积物是浊流沉积。本文通过对旬邑地区延长组岩心、测井资料的研究，认为研究区长8-长6油层组发育砂质碎屑流沉积。岩心中常见大段块状砂岩、面状碎屑组构、顶底突变接触、漂砾、底部剪切带及滑塌变形构造等，相应测井曲线特征以箱型为主。砂质碎屑流为风暴诱因，可见丰富的风暴沉积特征，如侵蚀构造、底模、浪成沙纹层理、波痕、生物逃逸迹等。研究区理想的风暴沉积单元由下向上可概括为：块状层理段（ A）；滞留沉积段（B）；平行层理段（C）；丘状交错层理或浪成沙纹层理段（D）；泥页岩段（E）。根据岩心风暴沉积特征总结出风暴岩的3个垂向沉积序列组合。砂质碎屑流及风暴作用的研究对于研究区油气勘探及古地理、古气候研究具有重要意义。
악이다사분지남부연장조장8-장6유층조침적상위곡류하삼각주-반심호、심호，중력류침적발육。이전인위저사중력류침적물시탁류침적。본문통과대순읍지구연장조암심、측정자료적연구，인위연구구장8-장6유층조발육사질쇄설류침적。암심중상견대단괴상사암、면상쇄설조구、정저돌변접촉、표력、저부전절대급활탑변형구조등，상응측정곡선특정이상형위주。사질쇄설류위풍폭유인，가견봉부적풍폭침적특정，여침식구조、저모、랑성사문층리、파흔、생물도일적등。연구구이상적풍폭침적단원유하향상가개괄위：괴상층리단（ A）；체류침적단（B）；평행층리단（C）；구상교착층리혹랑성사문층리단（D）；니혈암단（E）。근거암심풍폭침적특정총결출풍폭암적3개수향침적서렬조합。사질쇄설류급풍폭작용적연구대우연구구유기감탐급고지리、고기후연구구유중요의의。
The Chang-8 to Chang-6 oil reservoirs from the Yanchang Formation in the southern part of the Ordos Basin belong to the meandering delta-bathyal to abyssal lake deposits with developed gravity flow deposits. These gravity flow deposits were once reported as the turbidity current deposits and sandy debris flow deposits. The latter are supported by the authors on the basis of cores and well logs for the Yanchang Formation in the Xunyi region. These sandy debris flow deposits are originated from the storm processes,and characterized by the storm deposits such as erossional structures,sole casts,wave ripple laminations,wave marks and biological escape traces. The idealized depositional units of storm deposits in the study area consist of the intervals of massive beddings(A),lag deposits(B),parallel beddings( C),hummochy cross-beddings and / or wave ripple laminations( D),and argillutite(E),which are involved into three vertical depositional sequences. The approach to the sandy debris flow deposits and storm processes herein is significant to the study of palaeogeography and palaeoclimates and petroleum exploration in the study area.