石油实验地质
石油實驗地質
석유실험지질
EXPERIMENTAL PETROLEUM GEOLOGY
2014年
1期
1-7
,共7页
钱一雄%杜永明%陈代钊%尤东华%张军涛%陈跃%刘忠宝
錢一雄%杜永明%陳代釗%尤東華%張軍濤%陳躍%劉忠寶
전일웅%두영명%진대쇠%우동화%장군도%진약%류충보
沉积相%层序界面%微生物岩%奇格布拉克组%上震旦统%阿克苏%塔里木盆地
沉積相%層序界麵%微生物巖%奇格佈拉剋組%上震旦統%阿剋囌%塔裏木盆地
침적상%층서계면%미생물암%기격포랍극조%상진단통%아극소%탑리목분지
sedimentary facies%sequence boundary%microbial rock%Qigebulak Formation%upper Sinian%Aksu%Tarim Basin
震旦纪是塔里木盆地被动大陆边缘盆地重要的发育期。通过对阿克苏肖尔布拉克剖面上震旦统奇格布拉克组的实测及综合分析认为：奇格布拉克组的底、顶部分别发育Ⅲ级沉积间断的岩相转换面和Ⅱ级海侵上超层序不整合界面；内部发育加深间断面、向上变浅的Ⅳ至Ⅴ级层序界面，发育了受海平面变化控制的环潮型（向上变浅、变细、变薄）至潮下型（向上变浅、变粗、变厚）的碳酸盐岩米级旋回，叠层石相对发育，可能由多种形态的微生物席构成。奇格布拉克组可划分为下、中、上3个岩性段：其中，下亚段为潮上至潮间、潮间下部至潮间、潮间至潮上的振荡变化，中段为潮间下部至潮下带的频繁、振荡变化至潮下稳定的沉积环境；对应的碳同位素呈底部较强烈正偏，中上部较为稳定，且上部稍弱正偏的特征；海平面具有下部频繁变动、中上部稳定下降的变化趋势。
震旦紀是塔裏木盆地被動大陸邊緣盆地重要的髮育期。通過對阿剋囌肖爾佈拉剋剖麵上震旦統奇格佈拉剋組的實測及綜閤分析認為：奇格佈拉剋組的底、頂部分彆髮育Ⅲ級沉積間斷的巖相轉換麵和Ⅱ級海侵上超層序不整閤界麵；內部髮育加深間斷麵、嚮上變淺的Ⅳ至Ⅴ級層序界麵，髮育瞭受海平麵變化控製的環潮型（嚮上變淺、變細、變薄）至潮下型（嚮上變淺、變粗、變厚）的碳痠鹽巖米級鏇迴，疊層石相對髮育，可能由多種形態的微生物席構成。奇格佈拉剋組可劃分為下、中、上3箇巖性段：其中，下亞段為潮上至潮間、潮間下部至潮間、潮間至潮上的振盪變化，中段為潮間下部至潮下帶的頻繁、振盪變化至潮下穩定的沉積環境；對應的碳同位素呈底部較彊烈正偏，中上部較為穩定，且上部稍弱正偏的特徵；海平麵具有下部頻繁變動、中上部穩定下降的變化趨勢。
진단기시탑리목분지피동대륙변연분지중요적발육기。통과대아극소초이포랍극부면상진단통기격포랍극조적실측급종합분석인위：기격포랍극조적저、정부분별발육Ⅲ급침적간단적암상전환면화Ⅱ급해침상초층서불정합계면；내부발육가심간단면、향상변천적Ⅳ지Ⅴ급층서계면，발육료수해평면변화공제적배조형（향상변천、변세、변박）지조하형（향상변천、변조、변후）적탄산염암미급선회，첩층석상대발육，가능유다충형태적미생물석구성。기격포랍극조가화분위하、중、상3개암성단：기중，하아단위조상지조간、조간하부지조간、조간지조상적진탕변화，중단위조간하부지조하대적빈번、진탕변화지조하은정적침적배경；대응적탄동위소정저부교강렬정편，중상부교위은정，차상부초약정편적특정；해평면구유하부빈번변동、중상부은정하강적변화추세。
Sinian is one of the most important stages of the development of passive continental margin basin in the Tarim Basin. Based on the measurement and analysis of profiles of the Qigebulak Formation (Z2g) of the upper Sinian at Xianerbulak of Aksu, it has been concluded that theⅢ-order sequence boundary surfaces with hiatus and lithofacies transition and theⅡ-order surfaces with transgressive onlap and sequence unconformity interface develop at the bottom and on the top of the Qigebulak Formation, respectively. In the middle of the formation, deepening interruption surface and shallowing-upwardⅣ-Ⅴsequences develop. The Milankovitch cycle of carbonate rocks has been found, under either peritidal ( becoming shallow, fine-grained and thin upwards) or subtidal ( becom-ing shallow, coarse-grained and thick upwards) environments controlled by sea level changes. Stromatolites are widespread, mainly consisting of various microbial mats. The Qigebulak Formation can be divided into 3 lithologic sections from bottom to top, among which the lower section changes from supratidal to intertidal, the lower part of intertidal to intertidal, and intertidal to supratidal; the middle section is characterized by the frequent variation from the lower part of intertidal to subtidal and the stable environment of subtidal. Carbon isotopes are strongly positive at the bottom, stable in the middle and upper sections, and weakly positive at the top. Sea levels change frequently at the bottom, and stably decrease in the middle and upper sections.
