镇泾地区长8段致密低渗透油藏主控因素分析

鄂尔多斯盆地西南缘镇泾地区长8油藏具有渗透率低、丰度低、储量大的特点，已钻遇的多口高产井显示出长8良好的油气勘探潜力。通过沉积微层、层序、裂缝及湖盆底形分析，认为长81中期基准面上升半旋回中部的坝顶席状砂为高效储层发育段；与基底断裂有关的裂缝极大地改善了低渗透储层的渗流能力；长8湖盆底形的起伏控制着早白垩世晚期铁方解石的胶结作用，底形的高点是铁方解石弱胶结区，储层物性相对较好，为甜点发育区。通过主控因素分析，提出长8致密低渗透油藏勘探思路及工作方法，即“定层序、占高点、追裂缝、打河道”

Hydrocarbon Expulsion Characteristic of Hydrocarbon Source Rock and Prediction of Favorable Regions in Binbei Area

The source rocks in Binbei area are characterized by high organic matter richness and low maturity,and the strata are in the state of poor compaction.So it is vitally important for evaluating Binbei area to make sure whether hydrocarbon source rocks are available or not,and to fully understand how much oil and gas has been expulsed.This research implements a new method,hydrocarbon generation potential,to study the hydrocarbon expulsion characteristics in Binbei area.Taking hydrocarbon accumulation system as evaluating unit,analogy method is used to calculate the accumulation coefficient.On the basis of the accumulation coefficient,hydrocarbon accumulation systems are evaluated quantitatively,and then the favorable area is forecasted.