西南石油大学学报（自然科学版）
西南石油大學學報（自然科學版）
서남석유대학학보（자연과학판）
JOURNAL OF SOUTHWEST PETROLEUM UNIVERSITY(SEIENCE & TECHNOLOGY EDITION)
2013年
4期
25-34
,共10页
塔里木盆地%石炭系%东河砂岩%次生油藏%油气运移模式%启示
塔裏木盆地%石炭繫%東河砂巖%次生油藏%油氣運移模式%啟示
탑리목분지%석탄계%동하사암%차생유장%유기운이모식%계시
Tarim Basin%Carboniferous%Donghe sandstone%secondary hydrocarbon reservoir%oil migration patterns%impli-cations
塔北石炭系东河砂岩油藏主要由东河塘和哈得逊两个油藏构成。通过解析两个油藏的流体特征、充注时间、油区构造演化、油气运移通道及距离和储量规模，指出两个油藏的主要充注时间晚于烃源岩生烃时间，均为次生油藏，油源为奥陶系古油藏，新油藏靠近古油藏运移并聚集。推断东河塘和哈得逊具有不同的油气运移模式：东河塘构造型油藏原油来源于下伏的奥陶系油藏，借助纵向断裂运移至此；哈得逊为北倾的地层型圈闭，原油主要来源于北部的古油藏，运移通道为石炭系和志留系之间的不整合面。结合近5年来新钻井揭示的地质现象，认为塔北南部东河砂岩相变尖灭带油气成藏比较困难，后续勘探应当谨慎且尤需重视次生油藏成藏规律研究。
塔北石炭繫東河砂巖油藏主要由東河塘和哈得遜兩箇油藏構成。通過解析兩箇油藏的流體特徵、充註時間、油區構造縯化、油氣運移通道及距離和儲量規模，指齣兩箇油藏的主要充註時間晚于烴源巖生烴時間，均為次生油藏，油源為奧陶繫古油藏，新油藏靠近古油藏運移併聚集。推斷東河塘和哈得遜具有不同的油氣運移模式：東河塘構造型油藏原油來源于下伏的奧陶繫油藏，藉助縱嚮斷裂運移至此；哈得遜為北傾的地層型圈閉，原油主要來源于北部的古油藏，運移通道為石炭繫和誌留繫之間的不整閤麵。結閤近5年來新鑽井揭示的地質現象，認為塔北南部東河砂巖相變尖滅帶油氣成藏比較睏難，後續勘探應噹謹慎且尤需重視次生油藏成藏規律研究。
탑북석탄계동하사암유장주요유동하당화합득손량개유장구성。통과해석량개유장적류체특정、충주시간、유구구조연화、유기운이통도급거리화저량규모，지출량개유장적주요충주시간만우경원암생경시간，균위차생유장，유원위오도계고유장，신유장고근고유장운이병취집。추단동하당화합득손구유불동적유기운이모식：동하당구조형유장원유래원우하복적오도계유장，차조종향단렬운이지차；합득손위북경적지층형권폐，원유주요래원우북부적고유장，운이통도위석탄계화지류계지간적불정합면。결합근5년래신찬정게시적지질현상，인위탑북남부동하사암상변첨멸대유기성장비교곤난，후속감탐응당근신차우수중시차생유장성장규률연구。
The carboniferous Donghe sandstone oilfield consists of two hydrocarbon reservoirs(Donghetang and Hudson)in the north of Tarim Basin. After analyzing the fluid characteristics,time of reservoir filling,regional structural evolution,hy-drocarbon migration pathways,migration distance and reserve volumes of reservoirs,we conclude that the Donghetang and Hudson sandstone reservoirs are both secondary hydrocarbon reservoirs. Geochemical data(δ13C values and biomarker com-positions)indicate the oil source is the underlying Ordovician carbonate reservoir. Further study about the tectonic movements shows the Donghetang and Hudson have different oil accumulation patterns. The Donghetang arch formed in the Hercynian period and preserved to date,then oil migrated here vertically from the Ordovician reservoirs via the fractures. While the Hudson reservoir was a northward pinchout trap formed during the late Himalayan movement,then oil migrated here laterally from the north palaeo-oil pool via the unconformity interface between Carboniferous and Silurian formations. Because of the limited migration distance,the present secondary reservoirs only distribute close to the palaeo-reservoir. Based on the fact, we think that the future exploration aiming at the the Donghe sandstone fringe located in the southern part of the north Tarim Basin should be performed with great caution and more emphasis should be put on the study about hydrocarbon migration and emplacement on this site.
