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《中国海洋大学》 2010年
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Integrated Evaluation and Exploration Targets Optimisationin Garmsar Block, Iran

张宾  
【摘要】: Since China's reform and opening up to outsider world, Chinese economy has thrived rapidly and energy demand, especially demand for oil, has soared. But the recoverable oil reserves in China are decreasing after exploration and production for near half century, and the newly-discovered proven reserves fall far behind demand from economy development of our country. Shortage of energy reserves has threatened contury security and became a bottleneck to restrict sustainable economy development of China. To slove this problem, China Petroleum Chemical Corporation (SINOPEC) made a strategy called "Develop west of China, Stabilize east of China, Explore south of China and Expend oversea market" to increase energy reserves. With this strategy, SINOPEC has endeavored to participate in oversea oil exploration and development projects. Iran is rich in oil and gas reserves and is one of important oversea market for SINOPEC, Garmsar block is a important exploration area in Iran. Garmsar block is located in Central Iran Basin and has certain hydrocarbon potential according to past exploration records. Since 2006, SINOPEC has conducted Surface Geology Survey, GravityMagnetic Survey and 2D Seismic Survey in Garmsar Block, petroleum geology condition research has been made following these surveies results. But integrated and systematic geology evaluation to Garmsar block has not been conducted yet up to now. Therefore, in order to find oil and gas within a reasonable term, outline reserves and enter commercial production phase, the essential work for SINOPEC is making an integrated evaluation to Garmsar block and then optimizing exploration targets. Based on existing data and information such as seismic data, gravimetric data, field survey data, drilling data within and surrounding the area, as well as information of discovered oil and gas reservoir, we carried out systemic study on fundamental petroleum geology condition and key factors controlling reservoir forming in Grams block, Central Iran basin. Combined with structural interpretation, profitable traps were evaluated, and drilling targets were optimized. Through studies on this subject, we have achievements as follows: 1) By way of structural geological analysis, the report expatiated on tectonic evolution background, and investigated structural framework in Garmsar block. 2) By way of multidisciplinary analysis including stratigraphic geology, sedimentology, sequence stratigraphy, the report accomplished sequence analysis in scale of parasequence, and analyzed sedimentary facies in different members of Qom formation. 3) Based on large number of testing data and geological analysis result, the report studied source rock condition and evaluated hydrocarbon generation potential. 4) Based on reserovir property analysis, the reported predicted potential reserovir bed-cap rock assemblage. 5) Through dissection of discovered oil and gas field (reservoir), and combined with petroleum geological condition in Garmsar block, the subject summarized key factors controlling reservoir formation. 6) Exploration Risks for Garmsar block:crack is the important reservoir space and the crack reservoir has great inhomogeneity, but there is no good means to predict crack reservoir precisely so far. Hydrocarbon-generating potential in Garmsar block remain uncertainty, whether source rock in this block has sufficient potential to form big oil and gas field still need to be studied. 7) Based on the integrated studies, we evaluated profitable traps and finally put forward suggestions for further exoloration targets. Based on the integrated geological research, this Subject summarized exploration advantages and exploration risks in Garmsar Block and provided concrete suggestions for future exploration.
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