石油学报
石油學報
석유학보
ACTA PETROLEI SINICA
2013年
z2期
24-31
,共8页
生物礁%古地貌%成藏条件%珠江组%东沙隆起
生物礁%古地貌%成藏條件%珠江組%東沙隆起
생물초%고지모%성장조건%주강조%동사륭기
organic reef%palaeogeomorphology%reservoir-forming conditions%Zhujiang Formation%Dongsha uplift
珠江组生物礁是东沙隆起重要的油气勘探领域，勘探潜力巨大，目前已发现了多个油气田与含油气构造。综合古地理位置与形态，将珠江组生物礁划分为台缘礁、台内点礁、环礁、块礁及陆棚塔礁5种类型，不同类型生物礁的外部形态与内部充填不同。平面上，台缘礁呈串珠状分布于隆起中南部台缘带，点礁、环礁、块礁呈不规则星点状分布于台地内部。古地貌背景决定了生物礁类型，台缘礁发育于早期地貌坡折上，位于油气从凹陷向隆起运移的必经之路，成藏条件最好，邻近惠州凹陷及白云凹陷的礁体是下一步勘探的突破方向。点礁、塔礁的发育受控于早期断洼的翘倾作用，规模较小，早期断洼的供烃能力尚不明确，靠近北部凹陷带的礁体是勘探的优先选择。块礁、环礁围绕台内局部隆起分布，已发现的块礁油气田位于隆起中南部的油气运移主路径上，远离该区的礁体缺乏油气来源，勘探风险较大。
珠江組生物礁是東沙隆起重要的油氣勘探領域，勘探潛力巨大，目前已髮現瞭多箇油氣田與含油氣構造。綜閤古地理位置與形態，將珠江組生物礁劃分為檯緣礁、檯內點礁、環礁、塊礁及陸棚塔礁5種類型，不同類型生物礁的外部形態與內部充填不同。平麵上，檯緣礁呈串珠狀分佈于隆起中南部檯緣帶，點礁、環礁、塊礁呈不規則星點狀分佈于檯地內部。古地貌揹景決定瞭生物礁類型，檯緣礁髮育于早期地貌坡摺上，位于油氣從凹陷嚮隆起運移的必經之路，成藏條件最好，鄰近惠州凹陷及白雲凹陷的礁體是下一步勘探的突破方嚮。點礁、塔礁的髮育受控于早期斷窪的翹傾作用，規模較小，早期斷窪的供烴能力尚不明確，靠近北部凹陷帶的礁體是勘探的優先選擇。塊礁、環礁圍繞檯內跼部隆起分佈，已髮現的塊礁油氣田位于隆起中南部的油氣運移主路徑上，遠離該區的礁體缺乏油氣來源，勘探風險較大。
주강조생물초시동사륭기중요적유기감탐영역，감탐잠력거대，목전이발현료다개유기전여함유기구조。종합고지리위치여형태，장주강조생물초화분위태연초、태내점초、배초、괴초급륙붕탑초5충류형，불동류형생물초적외부형태여내부충전불동。평면상，태연초정천주상분포우륭기중남부태연대，점초、배초、괴초정불규칙성점상분포우태지내부。고지모배경결정료생물초류형，태연초발육우조기지모파절상，위우유기종요함향륭기운이적필경지로，성장조건최호，린근혜주요함급백운요함적초체시하일보감탐적돌파방향。점초、탑초적발육수공우조기단와적교경작용，규모교소，조기단와적공경능력상불명학，고근북부요함대적초체시감탐적우선선택。괴초、배초위요태내국부륭기분포，이발현적괴초유기전위우륭기중남부적유기운이주로경상，원리해구적초체결핍유기래원，감탐풍험교대。
The organic reef in Zhujiang Formation of Dongsha uplift is an important area with great potential for oil and gas explora-tion,where several oil &gas fields and hydrocarbon bearing structures have been discovered.Based on a comprehensive considera-tion of the palaeogeographic location and landform,the organic reef can be classified into five types,including platform margin reef,intraplatformal point reef,atoll,massive reef and tower reef in shelf zone.Each type of reef has various external form and internalfillings.In a planar view,the platform margin reef in string-of-beads pattern is distributed in platform margin of the central andsouthern uplift;the rest in an irregular star-like pattern are distributed in the interior of the platform.The types of reefs are deter-mined by palaeogeomorphic environment.Platform margin reef is developed in the early slope break zone,which is a necessary path-way for hydrocarbon migration from sag to uplift,and thus has the best reservoir-forming conditions.The reefs adjacent to Huizhousag and Baiyun sag are expected to be the next exploration breakthrough.As influenced by the tilted fault blocks during the early rif-ting stage,the patch and tower reefs are developed in a small scale.Due to uncertain hydrocarbon supplying ability of the early faultdepression,the reefs nearby northern sags are given the first priority for exploration.Atoll and massive reef are mainly distributed a-round regional uplifts in the platform.However,the oil &gas fields discovered in massive reef are located at the major hydrocarbonmigration pathway of mid-southern uplift,far from which the reefs are lack of hydrocarbon sources and have a high exploration risk.
