| Author's Name: Yu Hezhong, Qian Ling, Han Shouhua, Fu Jinjun, Ma Haibo |
| Institution: PetroChina Hangzhou Institute of Geology |
| Abstract: |
| There are four types of folds in the eastern part of Tarim Basin: (1)the strain folds that commonly develop in the central part of Manjiaer Sag，(2)the cleavage folds that usually are in the slope zones of Manjiaer and Yingjisu sags,(3)the tensional folds that majorly are in Tanan Uplift of Altun Mountain foreland and Tabei Uplift of Tianshan Mountain foreland, (4)the shear crack folds that mainly develop in the forelands of the Altun Mountain and the Tianshan Mountain. Three periods of fold neutral planes are superimposed in the eastern part of Tarim Basin, which formed during the Caledonian -Hercynian, the Indosinian -Yanshanian and the Himalayan periods. The last Himalayan neutral planes are of reconstruction to former paleo-neutral planes so that they play the important roles of controlling hydro carbon accumulation. Since this region had been a persistently subsiding aulacogen during early Paleozoic era and was a rapidly rising paleouplift during late Paleozoic to Triassic time, we are actually looking for oil and gas in the residual paleouplift. The strata of upper neutral planes are most denuded seriously in the paleouplift area while the residual strata of lower neutral planes are not favorable for hydrocarbon accumulation. The fact that relic oil and gas flows were met in some drills into the lower neutral planes of anticlines prefigures that the structural/lithologic reservoirs along the slope zones in lower neutral planes of adjacent syclines should be the hopefull prospecting locations. It is suggested that the Upper Sinian, the Middle to Lower Cambrian and the Lower Ordovician Penglaiba dolostone, as well as the Siluri an and Jurassic clastic rocks are the favorable exploration targets in this rigion. |
| Keywords: Fold; Structure type; Neutral plane; Hydrocarbon accumulation; Oil and gas prospecting; Eastern Tarim Basin |
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投稿时间：
2011-12-23 |
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