1、松遼盆地南部十屋斷陷油氣成藏規(guī)律研究        十屋斷陷位于松遼盆地東南隆起區(qū)東南緣,是下部斷陷盆地與上覆坳陷盆地的疊置的陸相含油氣盆地。本文對十屋斷陷的構造演化史、結構特征和反轉構造帶進行了系統(tǒng)研究;利用含油氣系統(tǒng)油氣系統(tǒng)理論對成藏組合進行了劃分,分析其成藏條件,在沉積相、地球化學研究基礎上,建立了十屋斷陷有機相模式;結合典型油氣藏解剖,分析油氣藏類型、分布特征和運聚特征;利用儲層流體包裹體測試成果,結合生烴史和構造演化史,確定了油氣成藏的期次和建立了動態(tài)成藏過程,分析了油氣成藏的主要控制因素;在上述研究工作

2、的基礎上。取得如下創(chuàng)新性成果和認識:1、十屋斷陷構造演化主要分為四個階段:斷陷前期地殼隆升和斷陷初期火山噴發(fā)階段、斷陷階段、坳陷階段和盆地抬升萎縮階段。斷陷構造層總體為西斷東超的不對稱箕狀斷陷,但盆地深層的結構特征比較復雜,發(fā)育有數(shù)個小型半地塹式斷陷。2、油氣的形成與分布局限于斷陷內,整個十屋斷陷可以看作是一個含油氣系統(tǒng)。將十屋地區(qū)斷陷層劃分了3個成藏組合,即深部成藏組合、中部成藏組合和上部成藏組合,深部成藏組合可分為自生自儲式成藏組合和上生下儲式成藏組合。3、主要源巖是沙河子組、營城組,干酪根以III、IIB型為主,深凹處存在型。受構造演化和埋藏史控制,十屋斷陷靠近桑樹臺斷層一側的深凹區(qū)及斷

3、陷初期的幾個小型斷陷中的烴源巖都達到過成熟,往東埋藏變淺,處于成熟階段。4、十屋斷陷深層儲層物性很差,儲層類型為低孔滲類,屬致密儲層。泉二段的泥巖蓋層具有區(qū)域性封蓋作用,斷陷層系的泥巖只能作為局部蓋層,同一蓋層橫向上的不均一性直接控制了該區(qū)油氣藏的分布。5、十屋斷陷層油氣藏類型有構造油氣藏、巖性油氣藏和構造-巖性復合油氣藏,以巖性油氣藏為主。縱向上存在二個油氣富集帶,平面上具有環(huán)帶分布特征,主要不整合面是天然氣聚集的主要場所。深部存在垂向運移為主的自生自儲型和側向運移為主的下生上儲型兩種成藏模式。6、十屋斷陷主要有三個成藏期,即登樓庫末期、泉頭-嫩江期和嫩江組末期。登樓庫和嫩江組時期,是這含油

4、氣系統(tǒng)成藏的關鍵時刻。構造是成藏的主要控制因素。7、根據(jù)油氣成藏模式和油氣分布規(guī)律,研究認為,十屋斷陷中央構造帶、西部陡坡帶,以及東南斜坡帶是油氣聚集的有利區(qū)帶。');ReplaceFont('EnDivSummary','Shiwu Fault Depression is a superposed terrestrial oil-bearing basin composed of the underlying fault-subsidence and the overlying depression. It is located in the southeas

5、tern edge of the Southeast Uplift in Songliao Basin. The paper study the tectonic evolution, structure features and reverse structural zones of Shiwu Fault Depression in detail. The hydrocarbon accumulation assemblages were classified based on the theory of petroleum system. The organic faces model

6、of the depression was constructed based on the integrated study of depositional environment, the origin of source rock and the organic matter types. The reservoir types, their distribution as well as hydrocarbon migration and accumulation features were analyzed based on the representative sections.

7、The hydrocarbon accumulation periods and the dynamic accumulating processes were determined based on reservoir fluid inclusions tests and the hydrocarbon generation history as well as tectonic evolution. The reservoir accumulation model was built based on these studies. Finally, this paper analyzed

8、the major control factors for hydrocarbon accumulation. Based on these studies, the remarkable achievements and understandings of this study are summarized as follows:1. Shiwu Fault Depression tectonic evolution can be divided into four stages, namely, the crust uplifting stage before fault-depressi

9、on and volcano eruption stage at the beginning of fault-depression; fault-depression stage; subsidence stage and the shrinking stage of basin uplifting. The general character of the fault-depression is an asymmetric dustpan-like depression, with faulting in the west and overlying in the east. But th

10、e deep structure is very complicated where the multiple small scale half-graben fault-depressions were developed.2. The whole Shiwu Fault Depression can be classified as an independent petroleum system. The stratigraphy can be vertically divided into three sets of hydrocarbon accumulation assemblage

11、s - lower hydrocarbon accumulation assemblage, middle accumulation assemblage and upper hydrocarbon accumulation assemblage. The lower one can be further divided into in situ type and upper-generation- lower-accumulation type.3. The major source rocks are the Shahezi Formation and the Yingcheng Form

12、ation. Controlled by tectonic evolution and burial history, the deep depression formations close to Sangshutan Fault and the source rocks in several small scale fault depressions formed at the initial stage of fault-depression are over-matured. To the east, the burial depth becomes shallower. the so

13、urce rocks are in mature stage.4. The lower parts of the reservoir in Shiwu Fault Depression are tight reservoir with low porosity and permeability. The shale of the second member of Quantou Formation acts as regional cap rocks. The shale deposited during fault-depression stage is local cap rocks. T

14、he horizontally discontinuous distribution of shale formation controls the distribution of reservoir.5. Reservoir types include the structural, the stratigraphical and the structural-stratigraphical, themajority reservoirs are stratigraphical type. Vertically there are two hydrocarbon accumulation z

15、ones, and horizontally the hydrocarbon accumulation zones show ring-shaped feature. The major unconformities are important gas accumulation areas. The hydrocarbon was accumulated by vertical migration and lateral migration respectively.6. This area has three major hydrocarbon accumulation periods, that is, the end of the Dengluoku stage, Quantou-Nenjiang stage and the end of Nenjiang stage. The end of Dengluoku stage and the Nenjiang stage are the key periods of hydrocarbon accumulation for the petroleum system. Structure is the control factor for h